# Conway's Game of Life

### Mathematics and Construction

###### Pattern Files for Chapter 4: Spaceships and Moving Objects

RLE, Macrocell, or LifeHistory code for all patterns that are displayed as figures in Chapter 4: Spaceships and Moving Objects are provided here. These patterns can be viewed in-browser by clicking on the "Show in Viewer" link near the code, or the patterns can be viewed and manipulated by copying and pasting the RLE code into Game of Life software like Golly.

All pattern files from this chapter in a .zip archive file (0.04 Mb)
###### Figure 4.1: basic spaceships

A four basic types of spaceships.

RLE code: Select all
```x = 36, y = 5, rule = B3/S23 20bo10b2o\$bo6bo2bo6bo3bo6bo4bo\$2bo9bo10bo11bo\$3o5bo3bo5bo4bo5bo5bo\$9b 4o6b5o6b6o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.3: glider color

16 gliders that all have the same color.

RLE code: Select all
```x = 47, y = 9, rule = B3/S23 2o4bo7bo4bo6bo3bobo6bo5bo\$b2o3b2o7bo4b2o2bobo4b2o6bobo2bo\$o4bobo5b3o3b 2o4b2o4bo7b2o3b3o4\$3o3b2o7bo4b2o4b2o3b3o5bobo4bo\$2bo2bobo6b2o4bobo2b2o 4bo7b2o3b2o\$bo5bo6bobo3bo6bo4bo7bo4b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.4: reflect glider change

Two gliders of different color.

RLE code: Select all
```x = 15, y = 3, rule = B3/S23 2bo10b2o\$obo9bobo\$b2o11bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.5: reflect glider change bees

A twin bees shuttle about to reflect a glider.

RLE code: Select all
```x = 29, y = 19, rule = B3/S23 5bo10b2o\$3bobo9bobo\$4b2o11bo6\$11bo\$2o8b2o15b2o\$2o7b2o16b2o\$10b2o2b2o4\$ 10b2o2b2o\$2o7b2o16b2o\$2o8b2o15b2o\$11bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.8(a): B29

A small c/4 diagonal spaceship with an isolated domino spark; discovered in September 2004.

RLE code: Select all
```x = 17, y = 10, rule = B3/S23 3b2o\$6bo\$o\$o10b2o\$b4ob2o3b2o\$3b2o2bobo4bo\$8b2o5b2o\$8bo5b2o\$8b2o\$7b2o! #C [[ GRID THEME BOOK ]]```

A c/4 period 4 spaceship. At the time of its discovery, the Canada goose was the smallest known diagonal spaceship other than the glider, but this record has since been beaten.

RLE code: Select all
```x = 13, y = 12, rule = B3/S23 10bo\$4bo4b2o\$2bo2bo\$2bobo2b3o\$2bob2ob3o\$5bo\$4b3o\$2bo2b4o\$o2b2o2b2o\$ob 2o6bo\$bo9b2o\$10b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.8(c): Crab

The smallest known diagonal spaceship other than the glider. Period 4 with speed c/4. It was discovered in September 2000.

RLE code: Select all
```x = 13, y = 12, rule = B3/S23 7b2o\$4bo2b2o\$3bobo4bo\$5bo5b2o\$3b2o5b2o\$o2bo2\$2bo\$2o\$3bo\$4b2o\$3b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.8(d): Orion 2

A diagonal period 4 c/4 spaceship.

RLE code: Select all
```x = 13, y = 13, rule = B3/S23 7b2o\$6bo\$6bob2o\$7bo\$5bob2o\$5bobo\$o\$bobob3o\$2o4b3o\$b3o4bo\$10bo\$11b2o\$ 10b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.9: b29 tagalong

A tagalong for the B29 glider tagalong. Found by Nicolay Beluchenko in 2005.

RLE code: Select all
```x = 18, y = 18, rule = B3/S23 12b2o\$14bo\$8b6o2bo\$7bo9bo\$15b3o\$7bo\$6bo2bo\$7b3o\$3b2o3bo\$6bo\$o\$o10b2o\$b 4ob2o3b2o\$3b2o2bobo4bo\$8b2o5b2o\$8bo5b2o\$8b2o\$7b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.10: tubstretcher

An infinitely growing pattern that stretches a tub.

RLE code: Select all
```x = 16, y = 12, rule = B3/S23 10b2o\$7bo2b2o\$bo4bobo4bo\$obo5bo5b2o\$bobo2b2o5b2o\$3bo2bo2\$5bo\$3b2o\$6bo\$ 7b2o\$6b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.11: lwss mwss hwss

The LWSS, MWSS, and HWSS.

RLE code: Select all
```x = 28, y = 5, rule = B3/S23 12bo10b2o\$o2bo6bo3bo6bo4bo\$4bo10bo11bo\$o3bo5bo4bo5bo5bo\$b4o6b5o6b6o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.12: orthogonal destroy

Some light, middle, and heavyweight spaceships about to destroy some small objects.

RLE code: Select all
```x = 111, y = 9, rule = B3/S23 43bo28bo11bo7bobo10bo\$14bo16b2o10bobo14b2o10bo10bobo6b2o11bobo\$obo9b2o 17b2o10b2o15b2o10bo10b2o8bo11b2o\$b2o10b2o\$bo28bo13bo13b2o10b2o10b2o10b 2o10b2o\$3bo2bo8bo2bo9bo3bo9bo3bo9bo4bo6bo4bo6bo4bo6bo4bo6bo4bo\$7bo11bo 13bo13bo14bo11bo11bo11bo11bo\$3bo3bo7bo3bo8bo4bo8bo4bo8bo5bo5bo5bo5bo5b o5bo5bo5bo5bo\$4b4o8b4o9b5o9b5o9b6o6b6o6b6o6b6o6b6o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.13(1): hwss eat1

A way of eating an HWSS

RLE code: Select all
```x = 29, y = 15, rule = B3/S23 21b2o\$20bo2bo\$21b3o\$18b3o\$18bo3b2o\$20b2obo\$2b2o17bobob2obo\$o4bo14bo2bo bob2o\$6bo14b3o\$o5bo17bo\$b6o16bobo\$22bo2bo\$21bo3b2o\$22b3o\$24bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.13(2): hwss eat2

A way of eating an HWSS

RLE code: Select all
```x = 24, y = 8, rule = B3/S23 20b2o\$20b2o\$2b2o\$o4bo\$6bo14b2o\$o5bo13bo2bo\$b6o13bo2bo\$21b2o! #C [[ GRID THEME BOOK ]]```

Killer toads A way of eating an HWSS

RLE code: Select all
```x = 24, y = 8, rule = B3/S23 \$2b2o17b3o\$o4bo14b3o\$6bo\$o5bo\$b6o\$20b3o\$21b3o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.14(a): Sidecar

An orthogonal period 4 c/2 tagalong for the heavyweight spaceship that was found in 1992.

RLE code: Select all
```x = 8, y = 10, rule = B3/S23 6bo\$bo5bo\$bo5bo\$bob5o2\$2b2o\$o4bo\$6bo\$o5bo\$b6o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.14(b): hwss x66

A tagalong for a heavyweight spaceship. Found by David Bell and Hartmut Holzwart in July 1992.

RLE code: Select all
```x = 9, y = 11, rule = B3/S23 6bo\$7b2o\$o2b3o2bo\$b3o4bo\$b2o2b3o2\$4b2o\$2bo4bo\$8bo\$2bo5bo\$3b6o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.14(c): Pushalong 1

An orthogonal period 4 c/2 pushalong that attaches to the front of a middleweight spaceship. Found in 1992.

RLE code: Select all
```x = 12, y = 13, rule = B3/S23 2bo\$o3bo\$5bo\$o4bo\$b5o3\$6b3o\$4bob4o\$8bobo\$10b2o\$5bob4o\$5bob3o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.14(d): Hivenudger

A period 4 c/2 orthogonal spaceship.

RLE code: Select all
```x = 13, y = 13, rule = B3/S23 o2bo5b4o\$4bo3bo3bo\$o3bo7bo\$b4o3bo2bo2\$6b2o\$6b2o\$6b2o2\$b4o3bo2bo\$o3bo7b o\$4bo3bo3bo\$o2bo5b4o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.15: lwss hwss pseudo

The three pseudo spaceships that can be constructed from mixing and matching two light, middle, and/or heavyweight spaceships.

RLE code: Select all
```x = 38, y = 11, rule = B3/S23 2b2o14b2o12b6o\$2ob2o11b2ob2o10bo5bo\$4o12b4o17bo\$b2o14b2o12bo4bo\$33b2o\$ b2o14b2o\$4o11bo4bo12b2o\$2ob2o16bo9bo4bo\$2b2o11bo5bo15bo\$16b6o9bo5bo\$ 32b6o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.16: lwss mwss flotillae

The three LWSS-MWSS flotillae.

RLE code: Select all
```x = 36, y = 10, rule = B3/S23 19b2o\$3b2o12b2ob2o10b4o\$b2ob2o11b4o10bo3bo\$b4o13b2o15bo\$2b2o27bo2bo\$2b o14bo13bo\$o3bo10bo3bo10bo3bo\$5bo14bo14bo\$o4bo9bo4bo9bo4bo\$b5o10b5o10b 5o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.17: Overweight spaceship

A would-be spaceship similar to the LWSS, MWSS and HWSS, but longer. It is unstable by itself, but can be escorted by other spaceships to produce a flotilla.

RLE code: Select all
```x = 8, y = 5, rule = B3/S23 2b3o\$o5bo\$7bo\$o6bo\$b7o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.18: owss flotilla

A flotilla involving an overweight spaceship.

RLE code: Select all
```x = 16, y = 8, rule = B3/S23 3o3b3o3b3o\$o2bobo2bo3bo2bo\$o7bo3bo\$o7bo3bo\$bobo4bo4bobo\$4bo3bo\$8bo\$5bo bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.19: switch engines 48

A pair of switch engines that *almost* stabilize each other.

RLE code: Select all
```x = 14, y = 14, rule = B3/S23 2bobo\$5bo\$bo2bo\$3o5\$12bo\$11bobo2\$10bo2bo\$10b2o\$10bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.20: switch engine infinite

Switch engines can "bounce off" of each other, creating an infinitely-large c/12 diagonal spaceship.

RLE code: Select all
```x = 48, y = 72, rule = B3/S23:T52,52 2bo\$bobo2\$o2bo\$2o\$o5\$2b2o\$bo\$2b2o6\$9bobo6bobo\$9bobo9bo\$10bo6bo2bo\$16b 3o5\$28bo\$27bobo2\$26bo2bo\$26b2o\$26bo5\$28b2o\$27bo\$28b2o6\$35bobo6bobo\$35b obo9bo\$36bo6bo2bo\$42b3o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.21: switch engines blocks

A pair of switch engines that have produced some troublesome debris.

RLE code: Select all
```x = 29, y = 29, rule = B3/S23 4bo\$3b4o2bo6bobo\$4b4obo9bo\$b2o3b3o6bo2bo\$2o2bo9b3o\$2obo\$2bo3\$26bo\$25bo bo2\$24bo2bo\$24b2o\$24bo5\$26b2o\$25bo\$25b2o\$25b3o\$26b2o\$24bob3o\$23bo3bo\$ 22bo2bo\$23b3o\$23b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.22: switch engines blocks destroy

A pair of switch engines destroying a trail of blocks.

RLE code: Select all
```x = 55, y = 55, rule = B3/S23 24b2o\$24b2o7\$16b2o\$16b2o7\$8b2o\$8b2o7\$2o\$2o8bo\$9bobo2\$8bo2bo\$8b2o43b2o\$ 8bo44b2o5\$10b2o\$9bo\$10b2o33b2o\$45b2o5\$17bobo6bobo\$17bobo9bo\$18bo6bo2bo 8b2o\$24b3o10b2o7\$29b2o\$29b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.23: 10-engine Cordership

A c/12 period 96 diagonal Cordership that uses 10 switch engines, which was the fewest possible known at the time of its discovery.

RLE code: Select all
```x = 87, y = 87, rule = B3/S23 36bo\$35b4o2bo6bobo\$36b4obo9bo\$33b2o3b3o6bo2bo\$32b2o2bo9b3o\$32b2obo\$24b 2o8bo\$24b2o2\$58bo\$57bobo2\$56bo2bo\$56b2o\$16b2o38bo\$16b2o4\$58b2o\$57bo\$ 58b2o\$8b2o\$8b2o\$45b3o\$45bobo\$45bobo\$41b2o4bo17bobo6bobo\$41b2o3b3o16bob o9bo\$42bo23bo6bo2bo\$2o41b4o25b3o\$2o8bo33b2o\$9bobo33bo2\$8bo2bo32bo\$8b2o 34bobo37bo\$8bo35b4o35bobo\$45b3o\$45bo12bo23bo2bo\$49b2o7b5o19b2o\$49b3o4b obo3bo19bo\$10b2o36b3o3b3o3b3o\$9bo40b3o2b2o\$10b2o44bo\$57b3o\$58b2o24b2o\$ 83bo\$83b2o\$83b3o\$17bobo6bobo55b2o\$17bobo9bo52bob3o\$18bo6bo2bo52bo3bo\$ 24b3o53bo2bo\$81b3o\$81b2o3\$36bo\$35bobo2\$34bo2bo\$34b2o43b2o\$34bo44b2o5\$ 36b2o\$35bo\$36b2o33b2o\$71b2o5\$43bobo6bobo\$43bobo9bo\$44bo6bo2bo8b2o\$50b 3o10b2o7\$55b2o\$55b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.24: cordership reflections

A collection of glider-reflecting and transforming reactions that can be performed by a Cordership.

RLE code: Select all
```x = 98, y = 94, rule = B3/S23 47bo\$46b4o2bo6bobo\$47b4obo9bo\$44b2o3b3o6bo2bo\$43b2o2bo9b3o\$43b2obo\$35b 2o8bo\$35b2o2\$69bo\$68bobo2\$67bo2bo\$67b2o\$27b2o38bo\$27b2o4\$69b2o\$68bo\$ 69b2o\$19b2o\$19b2o\$56b3o\$56bobo\$56bobo\$52b2o4bo17bobo6bobo\$52b2o3b3o16b obo9bo\$53bo23bo6bo2bo\$11b2o41b4o25b3o\$11b2o8bo33b2o\$20bobo33bo2\$19bo2b o32bo\$19b2o34bobo37bo\$19bo35b4o35bobo\$56b3o\$56bo12bo23bo2bo\$60b2o7b5o 19b2o\$60b3o4bobo3bo19bo\$21b2o36b3o3b3o3b3o\$20bo40b3o2b2o\$21b2o44bo\$68b 3o\$69b2o24b2o\$94bo\$b2o91b2o\$obo91b3o\$2bo25bobo6bobo55b2o\$28bobo9bo52bo b3o\$29bo6bo2bo52bo3bo\$35b3o53bo2bo\$92b3o\$92b2o3\$47bo\$46bobo2\$45bo2bo\$ 45b2o43b2o\$45bo44b2o5\$47b2o\$46bo\$25b2o20b2o33b2o\$24bobo55b2o\$26bo4\$54b obo6bobo\$54bobo9bo\$55bo6bo2bo8b2o\$61b3o10b2o7\$66b2o\$66b2o3\$29b2o\$30b2o \$29bo49b2o\$78b2o\$80bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.25: Puffer 2

An orthogonal period 140 c/2 puffer. The second puffer to be found. It uses two lightweight spaceships to escort a B-heptomino.

RLE code: Select all
```x = 5, y = 18, rule = B3/S23 2b2o\$2ob2o\$4o\$b2o3\$o\$2o\$b2o\$2o5\$2b2o\$2ob2o\$4o\$b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.26: Ecologist

A period 20 c/2 orthogonal spaceship based on one of the classic puffer trains.

RLE code: Select all
```x = 22, y = 19, rule = B3/S23 8bo2bo\$12bo6b2o\$8bo3bo4b2ob2o\$9b4o4b4o\$18b2o2\$10bo\$8bo4bo3bo\$2ob2o3bo 3bo4b2o\$o2bo8bo5b2o\$b3o13b2o\$6bo2bo\$7b2o3\$19b2o\$17b2ob2o\$17b4o\$18b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.27: (Forward) space rake

A rake that shoots a glider once every 20 generations.

RLE code: Select all
```x = 35, y = 20, rule = B3/S23 21bo2bo\$25bo6b2o\$21bo3bo4b2ob2o\$22b4o4b4o\$31b2o\$2o\$b2o20bo\$o20bo4bo3bo \$13b2ob2o3bo3bo4b2o\$13bo2bo8bo5b2o\$5b2o7b3o13b2o\$6b2o11bo2bo\$5bo14b2o 3\$32b2o\$14b2o14b2ob2o\$13b4o13b4o\$13b2ob2o13b2o\$15b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.28: Backward space rake

A backward rake that fires one glider every 20 generations.

RLE code: Select all
```x = 32, y = 21, rule = B3/S23 18bo2bo\$22bo6b2o\$18bo3bo4b2ob2o\$19b4o4b4o\$28b2o2\$20bo\$18bo4bo3bo\$10b2o b2o3bo3bo4b2o\$10bo2bo8bo5b2o\$11b3o13b2o\$16bo2bo\$17b2o3\$o28b2o\$obo24b2o b2o\$2o9b2o14b4o\$9b2ob2o14b2o\$9b4o\$10b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.29: Schick engine

An orthogonal period 12 c/2 tagalong found in 1972.

RLE code: Select all
```x = 20, y = 11, rule = B3/S23 15bo2bo\$19bo\$15bo3bo\$5b2o9b4o\$4b2o5b3o\$3o6b2ob2o\$4b2o5b3o\$5b2o9b4o\$15b o3bo\$19bo\$15bo2bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.30(a): Period 60 forward rake

A Schick engine next to a forward space rake destroys 1/3 of the gliders from the space rake, lets 1/3 of them pass unharmed, and turns the remaining 1/3 of them into blocks. A middleweight spaceship is used to delete those blocks, creating a forward rake that emits one glider every 60 generations.

RLE code: Select all
```x = 48, y = 28, rule = B3/S23 27bo2bo\$31bo\$27bo3bo\$17b2o9b4o\$16b2o5b3o\$12b3o6b2ob2o\$16b2o5b3o\$17b2o 9b4o\$8b2o17bo3bo2bo2bo\$9b2o20bo6bo6b2o\$8bo18bo2bo3bo3bo4b2ob2o\$b5o29b 4o4b4o\$o4bo38b2o\$5bo7b2o\$o3bo9b2o20bo\$2bo10bo20bo4bo3bo\$26b2ob2o3bo3bo 4b2o\$26bo2bo8bo5b2o\$18b2o7b3o13b2o\$19b2o11bo2bo\$18bo14b2o3\$45b2o\$27b2o 14b2ob2o\$26b4o13b4o\$26b2ob2o13b2o\$28b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.30(b): Period 60 backward rake

A Schick engine next to a backward space rake destroys 1/3 of the gliders from the space rake, lets 1/3 of them pass unharmed, and turns the remaining 1/3 of them into chaotic messes. A lightweight spaceship is used to delete those messes, creating a backward rake that emits one glider every 60 generations.

RLE code: Select all
```x = 47, y = 36, rule = B3/S23 33bo2bo\$37bo6b2o\$33bo3bo4b2ob2o\$34b4o4b4o\$43b2o2\$35bo\$33bo4bo3bo\$25b2o b2o3bo3bo4b2o\$25bo2bo8bo5b2o\$26b3o13b2o\$31bo2bo\$32b2o3\$15bo28b2o\$15bob o24b2ob2o\$15b2o9b2o14b4o\$24b2ob2o14b2o\$24b4o\$o24b2o\$obo14b2o\$2o14b4o\$ 6bo9b2ob2o\$6bo11b2o\$2bo2b2o4bobo\$2bo7bo2b2o\$2bo2b2o4bobo\$6bo11b2o\$6bo 9b2ob2o\$16b4o\$17b2o\$3bo2bo\$7bo\$3bo3bo\$4b4o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.31: Coe ship

An orthogonal period 16 c/2 spaceship discovered in October 1995 that can act as a puffer engine.

RLE code: Select all
```x = 10, y = 9, rule = b3/s23 4b6o\$2b2o5bo\$2obo5bo\$4bo3bob\$6bo3b\$6b2o2b\$5b4ob\$5b2ob2o\$7b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.32(a): coe ship back rake

Backward rake based on the Coe ship.

RLE code: Select all
```x = 16, y = 21, rule = B3/S23 b4o\$6o\$4ob2o\$4b2o4\$10b6o\$8b2o5bo\$6b2obo5bo\$10bo3bo\$12bo\$12b2o\$11b4o\$ 11b2ob2o\$13b2o\$2b6o\$bo5bo\$7bo\$bo4bo\$3b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.32(b): coe ship forward rake

Forward rake based on the Coe ship.

RLE code: Select all
```x = 30, y = 21, rule = B3/S23 15b4o\$14b6o\$4b4o6b4ob2o\$3b6o9b2o\$3b4ob2o\$7b2o2\$24b6o\$22b2o5bo\$20b2obo 5bo\$24bo3bo\$26bo\$26b2o\$25b4o\$25b2ob2o\$27b2o\$4b2o10b6o\$4ob2o8bo5bo\$6o 15bo\$b4o10bo4bo\$17b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.33(a): coe space rake

A backward space rake next to a backward Coe rake.

RLE code: Select all
```x = 23, y = 39, rule = B3/S23 8b4o\$7b6o\$7b4ob2o\$11b2o4\$17b6o\$15b2o5bo\$13b2obo5bo\$17bo3bo\$19bo\$19b2o\$ 18b4o\$18b2ob2o\$20b2o\$9b6o\$8bo5bo\$b2o11bo\$4o4bo4bo\$2ob2o5b2o7b2o\$2b2o 14b4o\$18b2ob2o\$20b2o5\$18b2o\$19b2o\$18b2o\$18bo3\$19b2o\$10b4o4b4o\$9bo3bo4b 2ob2o\$13bo6b2o\$9bo2bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.33(b): coe space rake stabilized

A backward space rake next to a backward Coe rake, with three lightweight spaceships added to suppress the gliders that would otherwise shoot off in various directions.

RLE code: Select all
```x = 69, y = 39, rule = B3/S23 54b4o\$53b6o\$53b4ob2o\$2b2o53b2o\$2ob2o\$4o\$b2o\$63b6o\$61b2o5bo\$23b4o32b2ob o5bo\$22bo3bo36bo3bo\$26bo38bo\$22bo2bo39b2o\$64b4o\$64b2ob2o\$66b2o\$55b6o\$ 54bo5bo\$47b2o11bo\$46b4o4bo4bo\$46b2ob2o5b2o7b2o\$48b2o14b4o\$64b2ob2o\$22b 4o40b2o\$21bo3bo\$25bo\$21bo2bo2\$64b2o\$65b2o\$64b2o\$64bo3\$65b2o\$56b4o4b4o\$ 55bo3bo4b2ob2o\$59bo6b2o\$55bo2bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.36: lightspeed signals

A collection of lightspeed signals.

RLE code: Select all
```x = 150, y = 13, rule = B3/S23 bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2b o2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo 2bo2bo2bo\$b148o2\$b14o2b10o2b120o\$o13b2o10b2o40bo13bo13bo12bo39bo\$b13o 3b9o3b12o2b24o4b11o4b10o3b10o4b14o2b20o\$40b2o11bo12bo14bo15bo10bo2bo 10bo3b2o\$b13o3b11o3b10o2b9o4b11o4b11o4b10o3b10o4b9o5bo3b18o\$o13b2o12b 2o22bo14bo14bo13bo12bo13bo2b2o21bo\$b14o2b12o2b96o2b20o2\$b148o\$bo2bo2bo 2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo 2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo 2bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.38(a): signal sink

A sink for two lightspeed signals in zebra stripes.

RLE code: Select all
```x = 42, y = 13, rule = B3/S23 bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo2bo\$b40o2\$b40o\$o5bo12bo21bo\$b5o 4b9o3b20o\$5bo14bo\$b5o4b9o3b20o\$o5bo12bo21bo\$b40o2\$b40o\$bo2bo2bo2bo2bo 2bo2bo2bo2bo2bo2bo2bo2bo2bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.38(b): signal oscillator

A source and a sink for a period 5 lightspeed signal, which result in a period 5 oscillator when combined. Found by Dean Hickerson in 1995.

RLE code: Select all
```x = 47, y = 16, rule = B3/S23 9b2o8b2o18b2o\$9b2o6bo2bo18bo\$6bo10b3o20b3o\$6b7o9bo2bo2bo2bo2bo2bo4bo\$ 12bo2b26obobo\$4b7obobo26bobobo\$2obo8b2ob2obo2b3o2b3o2b3o2b3o4bobo\$bobo bo7b2o3b2o3b2o3b2o3b2o3b2o2b2ob2o\$o2bo7b2o3b3o2b3o2b3o2b3o2b3o4bobo\$2o 2b6o4bo26bobobo\$10b3o3b25obobo\$4b2obo4bobobo2bo2bo2bo2bo2bo2bo2bo4bo\$ 5bob4o2bobo24b3o\$4bo5b2obo25bo\$5b3o5bo25b2o\$7bo5b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.39: zebra signal perpendicular

Some signals that travel perpendicular through zebra stripes at a speed of 2c/3. Found by Hartmut Holzwart in 2006.

RLE code: Select all
```x = 113, y = 43, rule = B3/S23 2bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo 3bo3bo3bo3bo3bo\$bobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobo\$bobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobobobobobobobobobobobobobo\$2obobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bob2o\$bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobo\$bobobobobobobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobobobobobobobobo\$2obobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob2o\$bobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobo\$bobobobobob2o2bobobobobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobobobo\$2obobobob2o4bobobobobobobobobobobobobobobobobobobobobobobo bobobob2o2bobobobobobobobobobobobobobobobobobobobob2o\$bobobobobo7bobo 2bo2bobobobobobobobobobobobobobobobobobobobob2o4bobobobobobobobobobobo bobobobobobobobobobo\$bobobob2o8bob2o4bobobobobobobobobobobobobobobob2o 2bobobobo7bobobobobobobobobobobobobobobobobobobobo\$2obobo9bob2o5b2obob obobobobobobobobobobobobobo5bob2o8bobobobobobobobobobobobobobobobobobo bob2o\$bobob2o3bobo2bobo6b2obobobobobobobobobobobobobob2o6b2o8bobobobob obobobobobobobobobobobobobobobobo\$bobobo2bobo2bob2o5bo2bobobobobobobob obobobobobobobo7bo9bobobobobobobobobobobobobobobobobobobobobo\$2obobobo 5bo2bo5bo2bob2o2bobobobobobobobobobob2o4bobo9bobobobobobobobobobobobob obobobobobobobobob2o\$bobobob3o3bobo7bobobo5bobobobobobobobo2bo4b2o2bo 9b4o2bob2o2bobobobobobobobobobobobobobobobo\$bobobo2bob2o2bo3bobo2bob2o 6bobobobobobobobobobo8bo5bo8b2o4bobobobobobobobobobobobobobobobo\$2obob o3bo3b2o2b3o3b2o8b2o2bobobobobobobobo7b3obobob9o7bobobobobobobobobobob obobobob2o\$bob2o4bo4b2o5b3o7bo5bobobobobobobob2obobo5bo20bobobobobobob obobobobobobobobo\$bo2bo5bo5bobo11b2o7bobobobobobo4b19o6bobobobobobobob obobobobobobobobobo\$2o2bo5bo5bobo11b2o7bobobobobobo22bo8bobobobobobobo bobobobobobobobob2o\$bob2o4bo4b2o5b3o7bo5bobobobobobobo4b19o6bobobobobo bobobobobobobobobobobobo\$bobobo3bo3b2o2b3o3b2o8b2o2bobobobobobobob2obo bo5bo20bobobobobobobobobobobobobobobo\$2obobo2bob2o2bo3bobo2bob2o6bobob obobobobobobobo7b3obobob9o7bobobobobobobobobobobobobobob2o\$bobobob3o3b obo7bobobo5bobobobobobobobobobo8bo5bo8b2o4bobobobobobobobobobobobobobo bobo\$bobobobo5bo2bo5bo2bob2o2bobobobobobobobobo2bo4b2o2bo9b4o2bob2o2bo bobobobobobobobobobobobobobobo\$2obobo2bobo2bob2o5bo2bobobobobobobobobo bobobobob2o4bobo9bobobobobobobobobobobobobobobobobobobobobob2o\$bobob2o 3bobo2bobo6b2obobobobobobobobobobobobobobo7bo9bobobobobobobobobobobobo bobobobobobobobobo\$bobobo9bob2o5b2obobobobobobobobobobobobobob2o6b2o8b obobobobobobobobobobobobobobobobobobobobo\$2obobob2o8bob2o4bobobobobobo bobobobobobobobobobo5bob2o8bobobobobobobobobobobobobobobobobobobob2o\$b obobobobo7bobo2bo2bobobobobobobobobobobobobobobob2o2bobobobo7bobobobob obobobobobobobobobobobobobobobo\$bobobobob2o4bobobobobobobobobobobobobo bobobobobobobobobobobobob2o4bobobobobobobobobobobobobobobobobobobobobo \$2obobobobob2o2bobobobobobobobobobobobobobobobobobobobobobobobobobob2o 2bobobobobobobobobobobobobobobobobobobobob2o\$bobobobobobobobobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobobobobobobo\$bobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo\$2obobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobobobobobobobobobobobobobob2o\$bobobobobobobobobobobobobobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobo\$bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobo\$2obobobobobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobob obobobobobobobobobobob2o\$bobobobobobobobobobobobobobobobobobobobobobob obobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo\$bo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobo\$2bo3bo3bo3bo3bo3bo3bo3bo3bo3b o3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.41(a): diagonal 2c3 signal

A diagonal signal that travels at 2c/3, found by Dean Hickerson in 1997.

RLE code: Select all
```x = 47, y = 49, rule = B3/S23 4b2o\$4b2o2\$2b4o\$bo4bo\$bo2b3o\$2obo5bo\$bob7o\$bobobo\$2obobo2b4o\$3bobobo4b o\$3bobobo2b3o\$4b2obobo5bo\$7bobo2b4o\$7bobobo\$6b2obobo2b4o\$9bobobo4bo\$9b obobo2b3o\$10b2obobo5bo\$13bobo2b4o\$13bobobo\$12b2obobo2b4o\$15bobobo4bo\$ 15bobobo2b3o\$16b2obobo5bo\$19bobo2b4o\$19bobobo\$18b2obobo2b4o\$21bobobo4b o\$21bobobo2b3o\$22b2obobo5bo\$25bobo2b4o\$25bobobo\$24b2obobo2b4o\$27bobobo 4bo\$27bobobo2b3o\$28b2obobo5bo\$31bobo2b4o\$31bobobo\$30b2obobo2b4o\$33bobo bo4bo\$33bobobo2b3o\$34b2obobo5bo\$37bobo2b4o\$37bobobo\$36b2obobo2b2o\$39bo bobo2bo\$39bo2bo2b2o\$40b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.41(b): diagonal 5c9 signal

A diagonal signal that travels at 5c/9, found by Dean Hickerson in 1997.

RLE code: Select all
```x = 52, y = 50, rule = B3/S23 4bob2o\$4b2o2bo\$7bo2bo\$2b5ob2obo2bo\$bo2bo3bo2b4o\$bob2obobobo6bo\$2obob4o bo2b5o\$3bo6bobo5b2o\$2obob4obo2bob2obobo\$o2bobo2bob2obobobo2bo\$2b2o2bo 2bo3bobo4bob2o\$4b2o4b4ob2o2b2o2bo\$4bo3bobo6bo3bo\$5b4obob5ob3o3bo\$9bobo 4bobo2b4o\$7bo3bo2bo3bobo6bo\$7b2o2bobob4obo2b5o\$10b2obo6bobo5b2o\$13bob 4obo2bob2obobo\$13bobo2bob2obobobo2bo\$12b2o2bo2bo3bobo4bob2o\$14b2o4b4ob 2o2b2o2bo\$14bo3bobo6bo3bo\$15b4obob5ob3o3bo\$19bobo4bobo2b4o\$17bo3bo2bo 3bobo6bo\$17b2o2bobob4obo2b5o\$20b2obo6bobo5b2o\$23bob4obo2bob2obobo\$23bo bo2bob2obobobo2bo\$22b2o2bo2bo3bobo4bob2o\$24b2o4b4ob2o2b2o2bo\$24bo3bobo 6bo3bo\$25b4obob5ob3o3bo\$29bobo4bobo2b4o\$27bo3bo2bo3bobo6bo\$27b2o2bobob 4obo2b5o\$30b2obo6bobo5b2o\$33bob4obo2bob2obo2bo\$33bobo2bob2obobobo2b2o\$ 32b2o2bo2bo3bobo\$34b2o4b4ob2o\$34bo3bobo6bo\$35b4obob5obo\$39bobo4bobo\$ 37bo3bo2bo3b2o\$37b2o2bobob3o2bo\$40b2obo5bo\$44bob3o\$45b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.41(c): diagonal c2 signal

A diagonal signal that travels at c/2, found by Hartmut Holzwart in 2003.

RLE code: Select all
```x = 50, y = 50, rule = B3/S23 bo\$obo\$bobo\$2bobo\$3bobo\$5bo\$7bo\$3bo3bo\$7b2o\$4b3o3bo\$8b3o\$9b2o\$12bo\$12b obo2\$13bobo\$14bobo\$15bobo2bo\$16bo5bo\$17b2o3bo\$22bo\$19b3o\$21bobo\$23b2o\$ 22b3o2\$25b2o\$28bo\$26bo2bo\$28bobo\$29bobo\$30bobo\$31bobo\$32bobo\$33bobo\$ 34bobo\$35bobo\$36bobo\$37bobo\$38bobo\$39bobo\$40bobo\$41bobo\$42bobo\$43bobo\$ 44bobo\$45bobo\$46bobo\$47bobo\$48bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.42: diagonal 2c3 almost elbow

An almost-elbow for the 2c/3 diagonal signal.

RLE code: Select all
```x = 60, y = 40, rule = B3/S23 4b2o\$4b2o\$53b2o\$2b4o46bo2bo2b2o\$bo4bo45bobobo2bo\$bo2b3o42b2obobo2b2o\$ 2obo5bo40bobobo\$bob7o40bobo2b4o\$bobobo41b2obobo5bo\$2obobo2b4o34bobobo 2b3o\$3bobobo4bo33bobobo4bo\$3bobobo2b3o30b2obobo2b4o\$4b2obobo5bo28bobob o\$7bobo2b4o28bobo2b4o\$7bobobo29b2obobo5bo\$6b2obobo2b4o22bobobo2b3o\$9bo bobo4bo21bobobo4bo\$9bobobo2b3o18b2obobo2b4o\$10b2obobo5bo16bobobo\$13bob o2b4o16bobo2b4o\$13bobobo17b2obobo5bo\$12b2obobo2b4o10bobobo2b3o\$15bobob o4bob2o6bobobo4bo\$15bobobo2b3obo4b2obobo2b4o\$16b2obobo4bo3bobobobo\$19b obo2b2o4bobobo2b4o\$19bobobo2b3obobobo5bo\$17b2o2bobobo2bobobo2b3o\$16bob ob2obo2bobobobo4bo\$16bobo2bob2obobobo2b4o\$17bobo2bo3bobobo\$18bo4b4obo 2b4o\$19b4o5bo5bo\$24b3ob4o\$19b5o3bo3bo\$19bo3bobo3b2o\$22bo2b4obobo\$23b2o 3bo2b2o\$25b2obo\$25bobo! #C [[ GRID THEME BOOK ]]```

An orthogonal 2c/3 period 18 fuse that burns cleanly through blinkers.

RLE code: Select all
```x = 101, y = 5, rule = B3/S23 2o2bob2o\$5obobo\$8bob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3o b3ob3ob3ob3ob3ob3o\$5obobo\$2o2bob2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.43(b): bi block fuse

An orthogonal 2c/3 bi-block fuse.

RLE code: Select all
```x = 67, y = 5, rule = B3/S23 b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$o 2bob2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$b2o \$5b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o\$5b2o 2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.44: Fast Forward force field

A reaction involving a lightweight spaceship and three gliders. In the absence of the incoming lightweight spaceship from the left, the gliders would simply annihilate one another, but as shown they allow the spaceship to advance 11 spaces in the course of the next 6 generations. Leithner named the fast Forward force field in honour of his favourite science fiction writer, the physicist Robert L. Forward.

RLE code: Select all
```x = 17, y = 7, rule = B3/S23 7bo6bo2b\$8bo6b2o\$2b2o2b3o5b2ob\$2ob2o12b\$4o9bo3b\$b2o9b2o3b\$12bobo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.46: diagonal lightspeed

A method of diagonal lightspeed communication. The middle glider at the bottom-left is teleported to the top-right through the large glider collision at lightspeed.

RLE code: Select all
```x = 290, y = 297, rule = B3/S23 173bobo\$176bo\$176bo\$173bo2bo\$174b3o60\$143bo\$144bo\$142b3o3\$140bo\$141bo\$ 139b3o3\$137bo\$138bo\$136b3o3\$134bo\$135bo\$133b3o3\$131bo\$132bo\$130b3o3\$ 128bo\$129bo\$127b3o3\$125bo\$126bo\$124b3o3\$122bo\$123bo\$121b3o3\$119bo\$120b o\$118b3o3\$116bo\$117bo\$115b3o3\$113bo172bo2bo\$114bo170bo\$112b3o170bo3bo\$ 285b4o2\$110bo\$111bo\$109b3o3\$107bo\$108bo\$106b3o3\$104bo\$105bo\$103b3o3\$ 101bo\$102bo\$100b3o3\$98bo\$99bo\$97b3o3\$95bo\$96bo\$94b3o3\$92bo\$93bo\$91b3o 3\$89bo140bo\$90bo138b2o\$88b3o138bobo\$225bo\$224b2o\$86bo137bobo\$87bo132bo \$85b3o131b2o\$219bobo\$215bo\$83bo130b2o\$84bo129bobo\$82b3o125bo\$209b2o\$ 209bobo\$80bo124bo\$81bo122b2o\$79b3o122bobo\$200bo\$199b2o\$77bo121bobo\$78b o116bo\$76b3o115b2o\$194bobo\$190bo\$74bo114b2o\$75bo113bobo\$73b3o109bo\$ 184b2o\$184bobo\$71bo108bo\$72bo106b2o\$70b3o106bobo\$175bo\$174b2o\$68bo105b obo\$69bo100bo\$67b3o99b2o\$169bobo\$165bo\$65bo98b2o\$66bo97bobo\$64b3o93bo\$ 159b2o\$159bobo\$62bo92bo\$63bo90b2o\$61b3o90bobo\$150bo\$149b2o\$59bo89bobo\$ 60bo84bo\$58b3o83b2o\$144bobo\$140bo\$56bo82b2o\$57bo81bobo\$55b3o77bo\$134b 2o\$134bobo\$53bo76bo\$54bo74b2o\$52b3o74bobo\$125bo\$124b2o\$50bo73bobo\$51bo 68bo\$49b3o67b2o\$119bobo\$115bo\$47bo66b2o\$48bo65bobo\$46b3o61bo\$109b2o\$ 109bobo\$44bo60bo\$45bo58b2o\$43b3o58bobo\$100bo\$99b2o\$41bo57bobo\$42bo52bo \$40b3o51b2o\$94bobo\$90bo\$38bo50b2o\$39bo49bobo\$37b3o45bo\$84b2o\$84bobo\$ 35bo44bo\$36bo42b2o\$34b3o42bobo\$75bo\$74b2o\$32bo41bobo\$33bo36bo\$31b3o35b 2o\$69bobo\$65bo\$29bo34b2o\$30bo33bobo\$28b3o29bo\$59b2o\$59bobo\$55bo\$54b2o\$ 54bobo\$50bo\$49b2o\$49bobo\$45bo\$31bo12b2o\$31b2o11bobo\$30bobo20\$9bo\$9b2o\$ 8bobo3\$7bo\$bo5b2o\$b2o3bobo\$obo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(a): c3 orthogonal

A c/3 orthogonal period 3 spaceship with 25 cells in each generation -- the lowest number of cells known for any c/3 spaceship.

RLE code: Select all
```x = 16, y = 5, rule = b3/s23 7b2obo5b\$4b2obob2ob3ob\$b4o2b2o6bo\$o4bo3bo3b2ob\$b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(b): Spider

A c/5 period 5 orthogonal spaceship found in April 1997. It is the smallest known c/5 orthogonal spaceship.

RLE code: Select all
```x = 27, y = 8, rule = B3/S23 9bo7bo9b\$3b2obobob2o3b2obobob2o3b\$3obob3o9b3obob3o\$o3bobo5bobo5bobo3bo \$4b2o6bobo6b2o4b\$b2o9bobo9b2ob\$b2ob2o15b2ob2ob\$5bo15bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(c): Loafer

A small c/7 orthogonal spaceship found on 17 February 2013.

RLE code: Select all
```x = 9, y = 9, rule = B3/S23 7bo\$6bobo\$5bo2bo\$6b2o2\$2bo5bo\$bobo3bo\$o2bo3b2o\$o2b2o3bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(d): c4 orthogonal

The smallest known c/4 orthogonal spaceship.

RLE code: Select all
```x = 19, y = 12, rule = B3/S23 bo\$bo8bo\$obo5bo3bo\$8bo3b2o\$5bob2o5b2o\$b6o2bo6bo\$2b2o6bo3b3o\$10bo3bob2o \$13bo\$18bo\$17bo\$17bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(e): c6 orthogonal

Period 6 c/6 orthogonal spaceship. Discovered in May 2009.

RLE code: Select all
```x = 26, y = 12, rule = 23/3 5b3o10b3o5b\$3obo7b2o7bob3o\$4bo3bo2bo2bo2bo3bo4b\$4bo5bo4bo5bo4b\$10b2o2b 2o10b\$7bo3bo2bo3bo7b\$7bobo6bobo7b\$8b10o8b\$10bo4bo10b\$8bo8bo8b\$7bo10bo 7b\$8bo8bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(f): 2c5 orthogonal

An orthogonal spaceship with period 5. The smallest known 2c/5 spaceship.

RLE code: Select all
```x = 13, y = 11, rule = b3/s23 4bo8b\$3b3o7b\$2b2ob2o6b2\$bobobobo2bo2b\$2o3bo3b3ob\$2o3bo6bo\$10bobo\$8bobo 2b\$9bo2bo\$12bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(g): Weekender

An orthogonal period 7 spaceship with speed 2c/7.

RLE code: Select all
```x = 16, y = 11, rule = B3/S23 bo12bob\$bo12bob\$obo10bobo\$bo12bob\$bo12bob\$2bo3b4o3bo2b\$6b4o6b\$2b4o4b4o 2b2\$4bo6bo4b\$5b2o2b2o! #C [[ GRID THEME BOOK ]]```

An c/10 orthogonal spaceship found on March 5, 2016.

RLE code: Select all
```x = 8, y = 12, rule = B3/S23 b2o2b2o\$3b2o\$3b2o\$obo2bobo\$o6bo2\$o6bo\$b2o2b2o\$2b4o2\$3b2o\$3b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.47(i): Soba

The third 3c/7 spaceship to be found -- after the original 3c/7 spaceship, called the "flying spaghetti monster", found by Tim Coe in 2016, and Dylan Chen's previous 3c/7 spaceship discovery "Anura"

RLE code: Select all
```x = 31, y = 40, rule = B3/S23 8b3o9b3o\$7bo3bo7bo3bo\$6bobo3bo5bo3bobo\$6bo3b2o7b2o3bo\$6b3o3bo5bo3b3o\$ 5bo3b2ob3ob3ob2o3bo\$5b2o2bo3b2ob2o3bo2b2o\$4b3o3b5ob5o3b3o\$12bo5bo\$9bo 11bo\$4bo4bo11bo4bo\$4bo4b4o5b4o4bo\$8bo4bo3bo4bo\$7b2ob3o5b3ob2o\$7b2obo3b obo3bob2o\$3b3o7b2ob2o7b3o\$2bo3b2o4bobobobo4b2o3bo\$bo3bo19bo3bo\$bo9b3o 3b3o9bo\$5bo6b2o3b2o6bo\$o12bo3bo12bo\$o2b2o5bo9bo5b2o2bo\$b2o8bo7bo8b2o\$ 5bo6bo5bo6bo\$5b2o17b2o\$6bo17bo\$15bo\$3b3o8bobo8b3o\$2bo6b3obo3bob3o6bo\$ 2b2o5bob3o3b3obo5b2o\$o7bo13bo7bo\$2b3obob2o11b2obob3o\$8b2o11b2o\$3ob2o2b o2bo7bo2bo2b2ob3o\$7bo4b2o3b2o4bo\$5bo19bo\$7bobo11bobo\$10bo9bo\$8bo13bo\$ 9bo11bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.48(a): c5 diagonal

The smallest known c/5 diagonal spaceship.

RLE code: Select all
```x = 23, y = 23, rule = B3/S23 b2o\$b2o\$o2bo\$o2bob2o\$o\$o2bo3b2o\$bo5b2o\$b5obo\$6bo3\$7b3o\$9bo\$10b2o\$11bo 4b2o\$11bo3b3o\$14bo4bo\$15bo3bo\$15bo\$15bobob2o\$15bo5b2o\$15b2o4b2o\$17b4o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.48(b): c6 diagonal

The smallest known c/6 diagonal spaceship. Found in March 2011.

RLE code: Select all
```x = 36, y = 36, rule = B3/S23 bo\$obo\$o2b2o2\$5bo\$3b2o2b2o\$7b2o\$8bo\$8bobo\$9b2o\$9bo2bo\$8bo4bo\$8bo5bo\$ 13bo3bo\$11b2o3bobo\$15b2ob2o\$12bobo4b2o\$12bo7b2o\$12bo9bo\$20b2o\$20bo\$19b o3bo\$22bobo\$17b3obo3bo\$21bo\$26b2o\$25b2o\$23b2o2b4o\$29b2o2\$31bo\$30bo2bo\$ 30bo2bo\$34bo\$35bo\$33b2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.48(c): Lobster

The first known c/7 diagonal spaceship (and currently the smallest known).

RLE code: Select all
```x = 26, y = 26, rule = B3/S23 11b3o\$13bo\$8b2o2bo\$8b2o\$12b2o\$11b2o\$10bo2bo2\$8bo2bo\$7bo3bo\$6bob3o\$5bo\$ 5bo13bobo2b2o\$6bo13b2obobo\$b2o13b2o2bo4bo\$o2b2o2b2o6bo3bo\$5bo2bo6bo6b 2o\$9b2o4bobo4b2o\$2bo3bo3bo5bo\$6b2o4bo2bo\$bobo5bo3b2o\$2o8bo\$5bo4bo\$7bo 3bo\$4b2o5bo\$4bo5bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.49: Sir Robin

The first elementary knightship to be found in Conway's Game of Life. Constructed by Adam P. Goucher in 2018, based on a partial spaceship by Tom Rokicki.

RLE code: Select all
```x = 79, y = 31, rule = B3/S23 70bo\$69bo2bo\$67bo3bob2o\$67bo3bo2bo\$71bobo2b3o\$69bobobo4bo\$68bo3bo2bo\$ 68bo6bobo\$68bo6b2o2\$48bo11b4obo4b2ob2o\$47bobo4b2obob2o2b3ob2ob2ob2o\$ 52b2o6bobobo3bo4b2o\$45b2o2b2obo6bobo4bo5b3o\$46bob3obo5bo5bo7bo\$45b2o2b 2o3bo3b2ob4obobo2b2o\$22bo22b3o3bo10bobob2o\$20bo24bob3obo6bo2bo\$20bo3b 3o8bo9b2o3bo2bo3bo5b3o\$20bo5b3o5bob2obo4bo2bo5bo3b4o\$21bobob2ob2o3b2o 3b2o2b2o3bo5bo3bo\$12bobo6b2o2bo2bob2obo5bob2o4bo5bobo\$7b2o2bo2b2o5b2o 2b2obobob2o4bo2bo11b2o\$6b3o2bo2b2o5b2o2b2obo3b2o2b2o3bobob2o\$bo3b4obob 2o3bob2obo2b3o2bo3bobo4bobob2o\$bob3o5b3o2bo4bo13bo4b2o\$o3bo4b2obo3bo2b obo11bo4bobo\$5bo3bo6b2o14bo2bobo\$5b2o4b3o3b2o15b2o2b2o\$6b3obo3bo18b3o\$ 6bo3bob2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.50(a): p2 spaceship

One of the earliest period 2 spaceships to ever be found.

RLE code: Select all
```x = 13, y = 27, rule = B3/S23 5bobo\$5bo2bo\$8b2o\$10bo\$8b4o\$o6bo4bo\$ob2o5bo2bo\$3bo5bo2bo\$3bo7bo\$5bob4o \$5bo3bo\$8bo\$4b5o2\$4b5o\$8bo\$5bo3bo\$5bob4o\$3bo7bo\$3bo5bo2bo\$ob2o5bo2bo\$o 6bo4bo\$8b4o\$10bo\$8b2o\$5bo2bo\$5bobo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.50(b): p8 puffer

A small period 224 puffer with a period 8 underlying mechanism. Found by Jason Summers on March 18, 2001.

RLE code: Select all
```x = 13, y = 27, rule = B3/S23 5bobo\$5bo2bo\$8b2o\$10bo\$8b4o\$o6bo4bo\$ob2o5bo2bo\$3bo5bo2bo\$3bo7bo\$5bob4o \$5bo3bo\$8bo\$4b5o2\$4b5o\$8bo\$2bo2bo3bo\$5bob4o\$bobo7bo\$3bo5bo2bo\$b3o5bo2b o\$7bo4bo\$8b4o\$10bo\$8b2o\$5bo2bo\$5bobo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.51(a): p8 rake

A small period 8 rake that was found by Jason Summers on March 18, 2001.

RLE code: Select all
```x = 31, y = 27, rule = B3/S23 23bobo\$23bo2bo\$26b2o\$28bo\$26b4o\$18bo6bo4bo\$18bob2o5bo2bo\$21bo5bo2bo\$ 21bo7bo\$23bob4o\$23bo3bo\$14b6o6bo\$13bo5bo2b5o\$19bo\$13bo4bo3b5o\$15b2o9bo \$20bo2bo3bo\$23bob4o\$13bo5bobo7bo\$12bo8bo5bo2bo\$7bo4b3o4b3o5bo2bo\$6bo 18bo4bo\$bo4b3o17b4o\$o27bo\$3o23b2o\$23bo2bo\$23bobo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.51(b): p8 bi blocks

Two rakes next to each other make a row of bi-blocks.

RLE code: Select all
```x = 61, y = 55, rule = B3/S23 53bobo\$53bo2bo\$56b2o\$58bo\$56b4o\$48bo6bo4bo\$48bob2o5bo2bo\$51bo5bo2bo\$ 51bo7bo\$53bob4o\$53bo3bo\$44b6o6bo\$43bo5bo2b5o\$49bo\$43bo4bo3b5o\$45b2o9bo \$50bo2bo3bo\$53bob4o\$43bo5bobo7bo\$42bo8bo5bo2bo\$37bo4b3o4b3o5bo2bo\$36bo 18bo4bo\$31bo4b3o17b4o\$30bo27bo\$25bo4b3o23b2o\$2o2b2o2b2o2b2o2b2o2b2o2bo 28bo2bo\$2o2b2o2b2o2b2o2b2o2b2o2b3o26bobo2\$2o2b2o2b2o2b2o2b2o2b2o2b3o 26bobo\$2o2b2o2b2o2b2o2b2o2b2o2bo28bo2bo\$25bo4b3o23b2o\$30bo27bo\$31bo4b 3o17b4o\$36bo18bo4bo\$37bo4b3o4b3o5bo2bo\$42bo8bo5bo2bo\$43bo5bobo7bo\$53bo b4o\$50bo2bo3bo\$45b2o9bo\$43bo4bo3b5o\$49bo\$43bo5bo2b5o\$44b6o6bo\$53bo3bo\$ 53bob4o\$51bo7bo\$51bo5bo2bo\$48bob2o5bo2bo\$48bo6bo4bo\$56b4o\$58bo\$56b2o\$ 53bo2bo\$53bobo! #C [[ GRID THEME BOOK ]]```

A rake whose period can be any sufficiently large multiple of 8 that is congruent to 8 mod 32, by moving the front two rakes father away from the rear rake and trailing LWSS/MWSS/HWSS cluster.

RLE code: Select all
```x = 125, y = 60, rule = B3/S23 70bobo\$70bo2bo\$73b2o\$75bo\$73b4o\$65bo6bo4bo39bobo\$65bob2o5bo2bo39bo2bo\$ 68bo5bo2bo42b2o\$68bo7bo45bo\$70bob4o44b4o\$70bo3bo37bo6bo4bo\$61b6o6bo38b ob2o5bo2bo\$60bo5bo2b5o41bo5bo2bo\$66bo48bo7bo\$60bo4bo3b5o43bob4o\$62b2o 9bo43bo3bo\$67bo2bo3bo33b6o6bo\$70bob4o31bo5bo2b5o\$60bo5bobo7bo36bo\$37b 6o16bo8bo5bo2bo29bo4bo3b5o\$36bo5bo11bo4b3o4b3o5bo2bo31b2o9bo\$42bo10bo 18bo4bo36bo2bo3bo\$27b2o7bo4bo6bo4b3o17b4o40bob4o\$25b2ob2o8b2o7bo27bo 31bo5bobo7bo\$25b4o13bo4b3o23b2o31bo8bo5bo2bo\$26b2o13bo28bo2bo27bo4b3o 4b3o5bo2bo\$41b3o26bobo27bo18bo4bo\$95bo4b3o17b4o\$94bo27bo\$89bo4b3o23b2o \$56b2o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2bo28bo2bo\$56b2o2b2o2b2o2b2o2b2o2b2o 2b2o2b2o2b3o26bobo\$52b2obo\$51bo2b4o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2b3o26b obo\$52b2ob3o2b2o2b2o2b2o2b2o2b2o2b2o2b2o2bo28bo2bo\$89bo4b3o23b2o\$94bo 27bo\$44b2o49bo4b3o17b4o\$43b4o53bo18bo4bo\$33b3o7b2ob2o53bo4b3o4b3o5bo2b o\$32b5o8b2o59bo8bo5bo2bo\$32b3ob2o69bo5bobo7bo\$35b2o80bob4o\$b4o109bo2bo 3bo\$6o103b2o9bo\$4ob2o100bo4bo3b5o\$4b2o107bo\$107bo5bo2b5o\$108b6o6bo\$ 117bo3bo\$117bob4o\$115bo7bo\$115bo5bo2bo\$112bob2o5bo2bo\$112bo6bo4bo\$120b 4o\$122bo\$120b2o\$117bo2bo\$117bobo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.53: Big glider

The first known diagonal spaceship other than the glider. Has period 4 and speed c/4.

RLE code: Select all
```x = 19, y = 19, rule = B3/S23 13bo\$10b5o\$10b2o2bo\$9bob2o\$16b2o\$7bobo7b2o\$7b2o6bobo\$6b3o6b3o\$4b2o10b 2o\$3bo9bobo\$3bo7b2o\$2o2b2o5b3o\$3obo6bo\$3bo3bo2bo\$o5b2o2bo\$5bo2b2o\$6bo\$ 6b2o\$4bob2o! #C [[ GRID THEME BOOK ]]```
###### Figure 4.54: almost knightship

An "almost knightship", found by Eugene Langvagen.

RLE code: Select all
```x = 19, y = 13, rule = B3/S23 5b3o2bob2o\$4bo4b2ob2obo\$15b2o\$4bo5bo2b3obo\$6b2o2b3obo2b2o\$3bo4b5o3bobo \$b2obo7bo3bobo\$bo4bob2obo4b2o\$2bo3bob2o7bo\$2bo3b2o6bobo\$bo12bobo\$o2bo 2bo\$3bo2bo! #C [[ GRID THEME BOOK ]]```
###### Figure 4.55: 17c/45_Reaction

A reaction between a pi-heptomino and a blinker in which the pi moves forward 17 cells in the course of 45 generations while the blinker moves back 6 cells and is rephased.

RLE code: Select all
```x = 16, y = 5, rule = B3/S23 o\$2o13bo\$b2o12bo\$2o13bo\$o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.1(a): color 1

Two gliders

RLE code: Select all
```x = 7, y = 3, rule = B3/S23 bo3bo\$2bobo\$3ob3o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.1(b): color 3

Two gliders

RLE code: Select all
```x = 7, y = 6, rule = B3/S23 o\$b2o\$2o\$5bo\$4b2o\$4bobo! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.1(c): color 2

Two gliders

RLE code: Select all
```x = 9, y = 6, rule = B3/S23 bo\$2bo\$3o\$6bobo\$7b2o\$7bo! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.6: Swan

A diagonal period 4 c/4 spaceship that produces some useful sparks.

RLE code: Select all
```x = 24, y = 12, rule = B3/S23 bo10b2o10b\$5o6b2o11b\$o2b2o8bo7b2ob\$2b2obo5b2o6b3obo\$11b2o3bob2o4b\$5bob o6b2o8b\$10b3obo4bo4b\$7b3o3bo4bo5b\$8bo7bo7b\$8bo6bo8b2\$11bo! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.7: c4 tagalong0

A small tagalong for c/4 diagonal spaceships.

RLE code: Select all
```x = 5, y = 5, rule = B3/S23 bo\$2bobo\$obo\$b2o\$bo! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.8: c4 tagalong1

A small tagalong for c/4 diagonal spaceships.

RLE code: Select all
```x = 5, y = 4, rule = B3/S23 b2o\$3o\$2o2bo\$o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.9(a): owss4

An overweight spaceship with a "spark" of length 4.

RLE code: Select all
```x = 9, y = 5, rule = B3/S23 2b4o\$o6bo\$8bo\$o7bo\$b8o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.9(b): owss10

An overweight spaceship with a "spark" of length 10.

RLE code: Select all
```x = 15, y = 5, rule = B3/S23 2b10o\$o12bo\$14bo\$o13bo\$b14o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.9(c): owss6

An overweight spaceship with a "spark" of length 6.

RLE code: Select all
```x = 11, y = 5, rule = B3/S23 2b6o\$o8bo\$10bo\$o9bo\$b10o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.10: large owss flotilla

A very overweight spaceship.

RLE code: Select all
```x = 21, y = 5, rule = B3/S23 2b16o\$o18bo\$20bo\$o19bo\$b20o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.11: Rephaser

A reaction in which two gliders hit a block and are recreated on different parallel lanes.

RLE code: Select all
```x = 20, y = 13, rule = B3/S23 2bo14bo\$obo14bobo\$b2o14b2o9\$9b2o\$9b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.15: switch engine reaction

A reaction in which two switch engines bounce off of each other and a third switch engine cleans up the debris.

RLE code: Select all
```x = 24, y = 30, rule = B3/S23 13bobo\$16bo\$12bo2bo\$11b3o6\$4b3o\$4b3o14bo\$3bo3bo12bobo\$b3ob2o\$o4b2o12bo 2bo\$o2bo15b2o\$b2o16bo5\$21b2o\$20bo\$20b2o\$20b3o\$21b2o\$19bob3o\$18bo3bo\$ 17bo2bo\$18b3o\$18b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.16: switch engine back

A reaction in which two switch engines bounce off of each other and destroy two trails of blocks.

RLE code: Select all
```x = 55, y = 55, rule = B3/S23 24b2o\$24b2o7\$16b2o\$16b2o7\$8b2o\$8b2o7\$2o\$2o\$9bo\$8bobo2\$7bo2bo42b2o\$7b2o 44b2o\$7bo5\$9b2o\$8bo36b2o\$9b2o34b2o6\$16bobo6bobo\$16bobo9bo8b2o\$17bo6bo 2bo9b2o\$23b3o6\$29b2o\$29b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.17: two switch engine block puffer

An arrangement of two switch engines that evolves into a puffer for a single diagonal row of blocks.

RLE code: Select all
```x = 41, y = 35, rule = B3/S23 33bo\$28bo2bobo2bo3bo\$28bo4b2ob5o\$28bo3bo4bobo2\$30b3o\$31bo\$15bo\$bobo6bo 2b4o\$o9bob4o\$bo2bo6b3o3b2o\$3b3o9bo2b2o\$16bob2o\$17bo8b2o\$26b2o2\$31b3o9\$ 6b2o\$6b2o7\$14b2o\$14b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.18: 3-engine Cordership

A diagonal c/12 period 96 3-engine Cordership found on January 12, 2004.

RLE code: Select all
```x = 66, y = 58, rule = B3/S23 20bo\$19b4o2bo6bobo\$20b4obo9bo\$17b2o3b3o6bo2bo\$16b2o2bo9b3o\$16b2obo\$8b 2o8bo\$8b2o6\$7b3o\$2o4bo4bo\$2o4b2obo\$10b3o\$19bo\$14bobobo9b2o\$14bo3b5o5b 2o\$14bo2bo2b3o\$15b2o5b2o\$23b2o\$24b2o\$25b2o\$25bo4bobo7b3o\$24bo6bo5b3o\$ 37b3o\$38bo2\$50bo\$49b4o2bo6bobo\$50b4obo9bo\$47b2o3b3o6bo2bo\$46b2o2bo9b3o \$46b2obo\$48bo5\$42bo\$40b4o\$40b4o\$39bo\$40bo\$40b4o5bo\$43bo4b2o\$37bo9bo10b 2o\$38b2o10b3o5b2o\$37b2o11b2o6\$50b2o\$50b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.20: 2 engine cordership

A 2-engine Cordership reflecting gliders in several different ways.

RLE code: Select all
```x = 360, y = 61, rule = B3/S23 328bobo\$329b2o\$13bobo313bo\$14b2o70bo\$14bo72bo172bo\$85b3o170bobo\$259b2o 5\$169bo\$25b2o78b2o60bobo15b2o78b2o78b2o\$25b2o78b2o61b2o15b2o78b2o78b2o 2\$20bo79bo79bo79bo79bo\$18b2obo76b2obo76b2obo76b2obo76b2obo\$18b2obo76b 2obo76b2obo76b2obo76b2obo\$15b3o2bo74b3o2bo74b3o2bo74b3o2bo74b3o2bo\$15b o79bo79bo79bo79bo\$15bobo15b2o60bobo15b2o60bobo15b2o60bobo15b2o60bobo 15b2o\$16b2o15b2o61b2o15b2o61b2o15b2o61b2o15b2o61b2o15b2o\$14bo79bo79bo 79bo79bo\$13bobo77bobo77bobo77bobo77bobo\$15bo79bo79bo79bo79bo\$12b2o78b 2o78b2o78b2o78b2o\$14bo79bo79bo79bo79bo\$11bobo77bobo77bobo77bobo77bobo\$ 11bobo77bobo77bobo77bobo77bobo\$10bo79bo79bo79bo79bo\$11b2o78b2o78b2o78b 2o78b2o\$4bo79bo79bo79bo79bo\$3bo31b5o43bo31b5o43bo31b5o43bo31b5o43bo31b 5o\$4bo4bo25bo48bo4bo25bo48bo4bo25bo48bo4bo25bo48bo4bo25bo\$8b2obo24b3o 49b2obo24b3o49b2obo24b3o49b2obo24b3o49b2obo24b3o\$7bo3bo24bobo48bo3bo 24bobo48bo3bo24bobo48bo3bo24bobo48bo3bo24bobo\$8b4o24bo51b4o24bo51b4o 24bo51b4o24bo51b4o24bo\$6b3o77b3o77b3o77b3o77b3o\$6bobo77bobo77bobo77bob o77bobo\$6bobo29b2o46bobo29b2o46bobo29b2o46bobo29b2o46bobo29b2o\$9bo27b 3o49bo27b3o49bo27b3o49bo27b3o49bo27b3o\$7b2o13bobo12bobo47b2o13bobo12bo bo47b2o13bobo12bobo47b2o13bobo12bobo47b2o13bobo12bobo\$21bo2bo76bo2bo 76bo2bo76bo2bo76bo2bo\$21bo2b2o75bo2b2o75bo2b2o75bo2b2o75bo2b2o\$22b3ob 2o74b3ob2o74b3ob2o74b3ob2o74b3ob2o\$2o22bo2bo52b2o22bo2bo52b2o22bo2bo 52b2o22bo2bo52b2o22bo2bo\$2o78b2o78b2o78b2o78b2o2\$23bo2bo76bo2bo76bo2bo 76bo2bo76bo2bo\$24bobo77bobo77bobo77bobo77bobo\$25bo79bo79bo79bo79bo3\$8b 2o78b2o78b2o78b2o78b2o\$8b2o78b2o78b2o78b2o78b2o\$23b2o78b2o78b2o78b2o 78b2o\$22b3o77b3o77b3o77b3o77b3o\$23b2o78b2o78b2o78b2o78b2o\$25bo79bo79bo 79bo79bo\$25bo79bo79bo79bo79bo\$25bo79bo79bo79bo79bo! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.21: corderrake

A "Corderrake": a rake based off of interacting switch engines.

RLE code: Select all
```x = 129, y = 77, rule = B3/S23 51bo\$50b4o2bo6bobo\$51b4obo9bo\$48b2o3b3o6bo2bo\$47b2o2bo9b3o\$47b2obo\$39b 2o8bo\$39b2o6\$38b3o\$31b2o4bo4bo\$31b2o4b2obo\$41b3o\$50bo\$b2o42bobobo9b2o\$ 2o43bo3b5o5b2o\$2bo42bo2bo2b3o\$46b2o5b2o\$54b2o\$55b2o\$56b2o\$56bo4bobo7b 3o\$55bo6bo5b3o13bo\$68b3o\$69bo10bo2\$84bob3o\$84bob3o\$77b2o8bo\$77b2ob3o3b o\$33b2o43bo6bo\$32b2o44bobobobo\$34bo48bo4\$82b2ob2o16bobo\$103bo2bo\$82bo 5bo14bobo\$83bo\$84bo3bob2o\$84bobo3bo12bo\$83bo3b3o11b2obo\$87bo13b2obo21b obo\$101bo3bo20b3o\$85b2o14b4o6bo15b2o\$65b2o19b2obo12b3o6bo\$64b2o21bobo 22bo\$66bo43b2o13bo\$109bo2bo12bobo\$110bobo12b3o\$82b2o40bo\$74b2o6b2o27bo 12b5o\$72b3o35bo2bo\$70b2obobo33b4o\$69bo3bo2bo32b2o\$69b2o41bo\$68bo7bo35b 2o\$68bo4b2o35bo2bo\$69bo40b3o\$111bo3\$122b2o\$122b2o7\$114b2o\$114b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.25: 2-glider synthesis of a block

A way of colliding two gliders to create a block.

RLE code: Select all
```x = 7, y = 5, rule = B3/S23 4bo\$4bobo\$bo2b2o\$2bo\$3o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.28: beehive wire

A beehive wick that can be burned.

RLE code: Select all
```x = 219, y = 4, rule = B3/S23 bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3b o3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo 3bo3bo3bo3bo3bo3bo3bo3bo\$obobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobo\$obobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobobo bobobobobobobobobobobobobobobobobobobobobobo\$bo3bo3bo3bo3bo3bo3bo3bo3b o3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo 3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo3bo! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.29: beehive puffer

A beehive puffer.

RLE code: Select all
```x = 48, y = 22, rule = B3/S23 44bo\$42bo3bo\$47bo\$16bo2b3o20bo4bo\$13b2o2bob2obo20b5o\$9bob4o3b3ob2o13b 2o\$8b5obo2bobob4o6b2o2b5obo\$6bo4bo4b4obo3bo5b4o7bo\$7bo6bo4bo2bo2b2o4bo 10bo\$bo5bo2bo3b5o3bo2bob3ob2o7b3o\$obo4bo2bo6bo5b2o9b3o2bo3bo\$obo4bo2bo 6bo5b2o9b3o2bo3bo\$bo5bo2bo3b5o3bo2bob3ob2o7b3o\$7bo6bo4bo2bo2b2o4bo10bo \$6bo4bo4b4obo3bo5b4o7bo\$8b5obo2bobob4o6b2o2b5obo\$9bob4o3b3ob2o13b2o\$ 13b2o2bob2obo20b5o\$16bo2b3o20bo4bo\$47bo\$42bo3bo\$44bo! #C [[ GRID THEME BOOK ]]```

A spaceship that can be turned into a puffer with arbitrarily large period. Displayed here as a spaceship with period 1136.

RLE code: Select all
```x = 127, y = 69, rule = B3/S23 10b2o\$8bo4bo\$14bo\$8bo5bo\$9b6o5\$78b6o\$77bo5bo\$83bo\$77bo4bo\$79b2o\$2b2o 86b2o\$o4bo82b2ob2o4b6o\$6bo81b4o4bo5bo\$o5bo82b2o11bo\$b6o89bo4bo\$98b2o5\$ 123bo\$121bo3bo\$126bo\$121bo4bo\$122b5o4\$44b2o2bob2o72b2o\$44b5obobo66bob 3ob2o\$52bob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3ob3o2b7o\$44b5obo bo67b5o\$44b2o2bob2o\$120b2o\$118bo4bo\$124bo\$118bo5bo\$119b6o8\$98b2o\$b6o 89bo4bo\$o5bo82b2o11bo\$6bo81b4o4bo5bo\$o4bo82b2ob2o4b6o\$2b2o86b2o\$79b2o\$ 77bo4bo\$83bo\$77bo5bo\$78b6o5\$9b6o\$8bo5bo\$14bo\$8bo4bo\$10b2o! #C [[ GRID THEME BOOK ]]```
###### Exercise 4.37: schick engine blinker puffer

A blinker puffer created by using two heavyweight spaceships to hassle the spark behind a Schick engine.

RLE code: Select all
```x = 47, y = 23, rule = B3/S23 35b2o\$33bo4bo\$39bo\$33bo5bo\$34b6o3\$43b4o\$42bo3bo\$38bo7bo\$33b7o2bo2bo\$3o 3b3o3b3o3b3o3b3o5bo2b3ob2o\$33b7o2bo2bo\$38bo7bo\$42bo3bo\$43b4o3\$34b6o\$ 33bo5bo\$39bo\$33bo4bo\$35b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.6(a): swan tubstretcher

A swan being used as a tubstretcher.

RLE code: Select all
```x = 24, y = 15, rule = B3/S23 bo10b2o\$5o6b2o\$o2b2o8bo7b2o\$2b2obo5b2o6b3obo\$11b2o3bob2o\$5bobo6b2o\$10b 3obo4bo\$7b3o3bo4bo\$8bo7bo\$8bo6bo2\$11b2o\$13bo\$12bobo\$13bo! #C [[ GRID THEME BOOK ]]```
###### Solution 4.6(b): swan duplicate

A swan being used to duplicate a glider.

RLE code: Select all
```x = 24, y = 16, rule = B3/S23 bo10b2o\$5o6b2o\$o2b2o8bo7b2o\$2b2obo5b2o6b3obo\$11b2o3bob2o\$5bobo6b2o\$10b 3obo4bo\$7b3o3bo4bo\$8bo7bo\$8bo6bo2\$11bo2\$5b2o\$6b2o\$5bo! #C [[ GRID THEME BOOK ]]```
###### Solution 4.9(a): owss4

A flotilla.

RLE code: Select all
```x = 9, y = 17, rule = B3/S23 b6o\$o5bo\$6bo\$o4bo2\$o6bo\$8bo\$o7bo\$b8o4\$b6o\$o5bo\$6bo\$o4bo\$2b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.9(b): owss10

A flotilla.

RLE code: Select all
```x = 15, y = 16, rule = B3/S23 7b4o\$6b6o\$6b4ob2o\$10b2o2\$2b2o\$o12bo\$14bo\$o13bo\$b14o3\$7b4o\$6b6o\$6b4ob2o \$10b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.9(c): owss6

A flotilla.

RLE code: Select all
```x = 11, y = 17, rule = B3/S23 3b6o\$2bo5bo\$8bo\$2bo4bo2\$o8bo\$10bo\$o9bo\$b10o4\$3b6o\$2bo5bo\$8bo\$2bo4bo\$4b 2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.10: large owss flotilla

A flotilla involving a very overweight spaceship.

RLE code: Select all
```x = 21, y = 28, rule = B3/S23 14b2o\$10b4ob2o\$10b6o\$11b4o3\$5b14o\$4bo13bo\$18bo\$4bo12bo\$2b2o\$o18bo\$20bo \$o19bo\$b20o4\$5b14o\$4bo13bo\$18bo\$4bo12bo\$6b2o2\$14b2o\$10b4ob2o\$10b6o\$11b 4o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.15: switch engine reaction

A 7-engine Cordership.

RLE code: Select all
```x = 70, y = 78, rule = B3/S23 41bo\$40bobo2\$39bo2bo\$39b2o\$39bo\$24b2o\$24b2o3\$41b2o\$40bo\$41b2o\$24bo\$16b 2o5b2o\$16b2o5b2o21b3o\$24bobo16b6o10bobo\$24b2o17b2o4bo12bo\$23bo20bo13bo 2bo\$22bo2bo18bo5bo6b3o\$22bo22bo2b2o\$23b3o\$8b2o\$8b2o17bo\$27bobo\$27bo22b 3o\$28bobo3b2o14b3o14bo\$30bo2b2o4bobo7bo3bo12bobo\$28bobo2b3o2bo2bo5b3ob 2o\$28b2o2b6obobo4bo4b2o12bo2bo\$2o30b2o2bo9bo2bo15b2o\$2o31b3o11b2o16bo\$ 34bo4\$67b2o\$66bo\$66b2o\$66b3o\$obo6bobo55b2o\$obo9bo52bob3o\$bo6bo2bo52bo 3bo\$7b3o53bo2bo\$64b3o\$64b2o3\$19bo\$18bobo2\$17bo2bo\$17b2o43b2o\$17bo44b2o 5\$19b2o\$18bo\$19b2o33b2o\$54b2o5\$26bobo6bobo\$26bobo9bo\$27bo6bo2bo8b2o\$ 33b3o10b2o7\$38b2o\$38b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.16(b): switch engine back

A way to use a reaction involving two switch engines to reflect a glider.

RLE code: Select all
```x = 46, y = 49, rule = B3/S23 15b2o\$15b2o7\$7b2o\$7b2o10\$3bo10b2ob2o\$o4bo11b2o\$o4bo7bobob2o\$bo11bobo\$ 13b2o4\$24b3o\$24b3o\$44b2o\$23b2obo17b2o\$22bo3bo\$22b3o5\$36b2o\$36b2o2\$24b 2o2\$26bo2\$23bo\$24b2o\$27b2o\$27bobo\$27bo! #C [[ GRID THEME BOOK ]]```
###### Solution 4.16(c): switch engine back cordership

A 7-engine Cordership reflecting a glider.

RLE code: Select all
```x = 78, y = 80, rule = B3/S23 35bo\$33b2o2b2obo6b2ob2o\$35b5obo8b2o\$34b2o4bo5bobob2o\$32bobo11bobo\$46b 2o\$24b2o6b3o\$24b2o33b3o\$59b3o2\$58b2obo\$57bo3bo\$57b3o2\$16b2o32bo\$16b2o 31b3o\$48b2ob2o\$48bobob2o\$47b3o2b3o\$46bo6bo\$46bob5o7bo\$45b2ob4o8bo\$8b2o 36bo13bo\$8b2o37bo11b3o2\$58bob2o\$59bo\$49bo23b2ob2o\$48bob2o24b2o\$72bobob 2o\$2o46bo23bobo\$2o46bo2bo20b2o\$8b3o39bo\$8b3o\$44b2o\$7b2obo32b2o5bo\$6bo 3bo33b2o3bo\$6b3o36bo3b2o\$50bo\$48bo\$51bo\$48bo2b2o\$49bobo2bo\$53b2o\$55bo 14b2o\$55b2o2b2o9b2o\$56bo2b2o\$56b2obo\$57b2o2\$24b2ob2o\$27b2o\$23bobob2o 33b2o\$23bobo36b2o\$23b2o4\$34b3o\$34b3o\$54b2o\$33b2obo17b2o\$32bo3bo\$32b3o 5\$46b2o\$46b2o2\$34b2o2\$36bo2\$33bo\$34b2o\$37b2o\$37bobo\$37bo! #C [[ GRID THEME BOOK ]]```
###### Solution 4.18(b): 3 engine cordership

A 3-engine Cordership can reflect a glider.

RLE code: Select all
```x = 66, y = 87, rule = B3/S23 20bo\$19b4o2bo6bobo\$20b4obo9bo\$17b2o3b3o6bo2bo\$16b2o2bo9b3o\$16b2obo\$8b 2o8bo\$8b2o6\$7b3o\$2o4bo4bo\$2o4b2obo\$10b3o\$19bo\$14bobobo9b2o\$14bo3b5o5b 2o\$14bo2bo2b3o\$15b2o5b2o\$23b2o\$24b2o\$25b2o\$25bo4bobo7b3o\$24bo6bo5b3o\$ 37b3o\$38bo2\$50bo\$49b4o2bo6bobo\$50b4obo9bo\$47b2o3b3o6bo2bo\$46b2o2bo9b3o \$46b2obo\$48bo5\$42bo\$40b4o\$40b4o\$39bo\$40bo\$40b4o5bo\$43bo4b2o\$37bo9bo10b 2o\$38b2o10b3o5b2o\$37b2o11b2o6\$50b2o\$50b2o27\$24b2o\$23bobo\$25bo! #C [[ GRID THEME BOOK ]]```
###### Solution 4.20(a): 2 engine cordership

A glider bouncing back and forth between two 2-engine Corderships.

RLE code: Select all
```x = 128, y = 73, rule = B3/S23 113bo\$113b2o\$111b5o\$96bo19bo\$96bo13bo5b2o\$96bo5bobo8b2ob3o\$102bobo3b2o 2b2obobo\$103bo5b2o2bo2bo\$113b2o\$87b2o20bob2o\$87b2o5b3o12bo\$94bo2b2o\$ 95b3o26b3o\$96bo27bobo\$108b2o14bobo\$107bo2bo9b2o4bo\$107b3o10b2o3b3o\$ 107b2o12bo\$108bo13b4o\$107b2obo12b2o\$84b2o21b4o13bo\$106bobobo\$105b2ob2o 13bo\$79bobo24bo3bo12bobo\$80bo26b3o13b4o\$108bo15b3o\$124bo3\$14b2o\$14b2o 93b3o\$108bobo\$108bo2bo\$108bo2bo\$109bobo8b2o\$18bo89bo2bo8b2o\$17b2o90b2o \$6b2o8bo2bo89bo\$6b2o8bobo\$16bo2bo\$16bo2bo\$17bobo\$16b3o93b2o\$112b2o2\$ 49b2o\$3bo44bobo\$b3o15bo30bo\$b4o13b3o\$2bobo12bo3bo\$4bo13b2ob2o\$17bobobo \$3bo13b4o\$3b2o12bob2o\$2b4o13bo\$6bo12b2o\$3o3b2o10b3o\$bo4b2o9bo2bo\$bobo 14b2o\$bobo27bo\$b3o26b3o\$29b2o2bo\$18bo12b3o5b2o\$15b2obo20b2o\$13b2o\$11bo 2bo2b2o5bo\$10bobob2o2b2o3bobo\$9b3ob2o8bobo5bo\$10b2o5bo13bo\$11bo19bo\$ 12b5o\$13b2o\$14bo! #C [[ GRID THEME BOOK ]]```
###### Solution 4.21(b): backward corderrake

A backward Corderrake.

RLE code: Select all
```x = 167, y = 137, rule = B3/S23 35bo\$33b2o2b2obo6b2ob2o\$35b5obo8b2o\$34b2o4bo5bobob2o\$32bobo11bobo\$46b 2o\$24b2o6b3o\$24b2o33b3o\$59b3o2\$58b2obo\$57bo3bo\$57b3o2\$16b2o32bo\$16b2o 31b3o\$48b2ob2o\$48bobob2o\$47b3o2b3o\$46bo6bo\$46bob5o7bo\$45b2ob4o8bo\$8b2o 36bo13bo\$8b2o37bo11b3o2\$58bob2o\$59bo\$49bo23b2ob2o\$48bob2o24b2o\$72bobob 2o\$2o46bo23bobo\$2o46bo2bo20b2o\$8b3o39bo\$8b3o\$44b2o\$7b2obo32b2o5bo\$6bo 3bo33b2o3bo\$6b3o36bo3b2o\$50bo\$48bo\$51bo\$48bo2b2o\$49bobo2bo\$53b2o\$55bo 14b2o\$55b2o2b2o9b2o\$56bo2b2o\$56b2obo\$57b2o2\$24b2ob2o\$27b2o\$23bobob2o 33b2o\$23bobo36b2o\$23b2o4\$34b3o\$34b3o\$54b2o30bobo\$33b2obo17b2o30bo2bo2b o7bobo\$32bo3bo49bob2obobo5b2ob2o\$32b3o57bo6b2obo\$84b3o11bo\$84b2o13bo\$ 76b2o7b2o12bo\$76b2o\$46b2o\$46b2o2\$34b2o\$75b2o\$36bo37bo2bo\$68b2o4bo2bo\$ 33bo34b2o4b4obo\$34b2o41bo2bo\$37b2o39bobo\$37bobo41b2o3bo9b2o\$37bo49bo8b 2o\$81bo2b2o\$82b4o6bo\$92b3o\$91bo3bo\$92bo2bo10b2ob2o\$92bo2bo13b2o\$93b2o 10bobob2o\$105bobo\$105b2o2\$123b3o\$116bo\$114b3o5b2o\$69b2o44bo4b4o\$69bobo 43b2ob3ob2o\$69bo46bobo4\$141bo\$140bobo\$139bo3bo\$119b2o19bobo\$120b2o5bo 13bo\$119b3o3bo\$120bo3bo3bo9b4o\$121b7o9bo4bo\$5bo115bo2b3o13bo22b3o\$3b2o 118bo12bo2bo3bo19bobo\$4b2o95b2o18b2o14bob3obo19b3o\$101bobo18bo2bo12bob 3o5b2o\$101bo21b2o21b2o2bo\$146b2ob2o11b2o\$146bo14b2ob2o\$148b2o10b2o2b2o \$119b2o27bo11b2o3b2o\$108bo10b2o39b2o2b2o\$108b4o50bobo\$110b2o\$106bob2o\$ 104b2ob2o\$104bo2b2o37b3o\$105b2o40bob3o\$146b2ob2o\$146b2ob2o\$148bo2\$159b 2o\$159b2o7\$151b2o\$151b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.21(c): lwss corderrake

A Corderrake that shoots lightweight spaceships.

RLE code: Select all
```x = 178, y = 141, rule = B3/S23 36bo\$35b4o2bo6bobo\$36b4obo9bo\$33b2o3b3o6bo2bo\$32b2o2bo9b3o\$32b2obo\$24b 2o8bo\$24b2o2\$58bo\$57bobo2\$56bo2bo\$56b2o\$16b2o38bo\$16b2o4\$58b2o\$57bo\$ 58b2o\$8b2o\$8b2o\$45b3o\$45bobo\$45bobo\$41b2o4bo17bobo6bobo\$41b2o3b3o16bob o9bo\$42bo23bo6bo2bo\$2o41b4o25b3o\$2o8bo33b2o\$9bobo33bo2\$8bo2bo32bo\$8b2o 34bobo37bo\$8bo35b4o35bobo\$45b3o\$45bo12bo23bo2bo\$49b2o7b5o19b2o\$49b3o4b obo3bo19bo\$10b2o36b3o3b3o3b3o\$9bo40b3o2b2o\$10b2o44bo\$57b3o\$58b2o24b2o\$ 83bo\$83b2o\$83b3o\$17bobo6bobo55b2o\$17bobo9bo52bob3o\$18bo6bo2bo52bo3bo\$ 24b3o53bo2bo\$81b3o\$81b2o3\$36bo\$35bobo2\$34bo2bo\$34b2o43b2o\$34bo44b2o28b 3o\$109bobo\$108bo3bo\$108bo3bo\$93b2o17bo\$36b2o55b2o11b2o4bo\$35bo69bo6bo\$ 36b2o33b2o32bo5bo\$71b2o37b2o\$105bo3bo\$94b2o10bobo\$94bo\$85b2o6b3o\$43bob o6bobo30b2o22b3o\$43bobo9bo38bo13bo3bo\$44bo6bo2bo8b2o28bo14bo2bo\$50b3o 10b2o28b2o13b2o3\$96bobo\$96b4o\$96b2o2bo\$99b3o15bo\$55b2o40b3o16bobo\$55b 2o48bo9b2ob2o\$94bo9bo3bo6b2ob2o\$30b2o61b2o13bo9b3o\$29b2ob2o59bobo9bo8b o3b3o\$30b4o73bo5bo4b3o\$31b2o35b2o42bo5b2o\$67b2o48b3o\$69bo47b2o\$116b2o\$ 138bo\$138b2o\$119b2o15b5o\$119b2o20bo\$135bo5b2o\$127bobo8b2ob3o\$127bobo3b 2o2b2obobo\$128bo5b2o2bo2bo11b3o\$138b2o6bo\$134bob2o6b3o5b2o\$119b3o12bo 10bo4b4o\$119bo2b2o21b2ob3ob2o\$100b2o18b3o23bobo\$99b2o20bo55bo\$101bo75b o\$168bo8bo\$168bobo\$167bo3bo2b3o\$169b5obo\$169bo\$136b2o18b2o15b2o\$136b2o 18b2o2\$147b2o\$147b2o7bobo\$147bo5bo4bo\$152bobo4bo\$151bo6bo\$128b2o22b4o 2bo\$128b2o26bo9bo\$164b4o\$163bob5o\$155bo6b2o6bo2b3o\$152bo4bo5b3obo3bo\$ 152bo5bo5b2o2bobo\$152bo\$154bo2bo\$154b3o4b2o\$161b2o\$160b2o\$160b2o6b2o\$ 160b3o5b2o\$160bo\$159bo\$158bo\$157b3o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.22(a): six cell schick

A 6-cell object behind two LWSSes that evolves into a Schick engine.

RLE code: Select all
```x = 10, y = 9, rule = B3/S23 7b2o\$5b2ob2o\$bo3b4o\$2bo3b2o\$o2bo\$2bo3b2o\$bo3b4o\$5b2ob2o\$7b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.23: back to forward space rake

A modified forward space rake.

RLE code: Select all
```x = 40, y = 27, rule = B3/S23 26bo2bo\$30bo6b2o\$26bo3bo4b2ob2o\$27b4o4b4o\$36b2o2\$28bo\$5b2o19bo4bo3bo\$ 3bo4bo9b2ob2o3bo3bo4b2o\$9bo8bo2bo8bo5b2o\$3bo5bo9b3o13b2o\$4b6o14bo2bo\$ 25b2o3\$8bo28b2o\$8bobo24b2ob2o\$8b2o9b2o14b4o\$17b2ob2o14b2o\$17b4o\$18b2o 2\$b6o\$o5bo\$6bo\$o4bo\$2b2o! #C [[ GRID THEME BOOK ]]```
###### Solution 4.32: c5 diagonal reflect

A c/5 diagonal spaceship about to reflect a glider.

RLE code: Select all
```x = 30, y = 23, rule = B3/S23 8b2o\$7bo2b2o\$9b3o\$9bobo\$9bo2b4o\$9bo3b3o\$10b2obo\$7bo6bo\$8bo4b2o\$10b3o\$ 15b2o\$15b2o\$15b2o\$17b3o\$2o15b3o4b2o\$b2o18b2ob2o\$o20bob3o\$20bo4bo\$20bo 2bo2b3o\$20bo2bo3b2o\$24b4obo\$21bo7bo\$22bo5bo! #C [[ GRID THEME BOOK ]]```