Cloverleaf interchange

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Cloverleaf interchange
x = 13, y = 13, rule = B3/S23 4bo3bo4b$3bobobobo3b$3bobobobo3b$b2o2bobo2b2ob$o4bobo4bo$b4o3b4ob$13b$ b4o3b4ob$o4bobo4bo$b2o2bobo2b2ob$3bobobobo3b$3bobobobo3b$4bo3bo4b! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ THUMBSIZE 2 HEIGHT 480 ]]
Pattern type Strict still life
Number of cells 56
Bounding box 13 × 13
Discovered by Adam P. Goucher
Year of discovery 2016
For other uses of cloverleaf, see Cloverleaf (disambiguation).

Cloverleaf interchange (or fourfold racetrack-weld-racetrack) is a 56-cell still life exhibiting D8_1 symmetry.

While known for many years beforehand due to its ability to be hassled, it is notable due to a natural occurrence being found in the ash of a random asymmetric soup by Adam P. Goucher on August 12, 2016.[1][2] This made it the single largest known still life to occur completely naturally, surpassing the previous record holder, the 46-cell professor; it had previously arisen semi-naturally in various higher symmetries, including C2_1, C4_1, D2_+1, D4_+1, D4_+2 and D4_x1. It has since been tied in C1 by another, unnamed 56-cell still life found by John Goodman in September 2021.[3]

BlinkerSpawn found a 12-glider synthesis on August 12, 2016.[4] GUYTU6J improved this to 10 gliders on February 5, 2020.[5]

A cloverleaf interchange can be hassled by carnival shuttles:

x = 49, y = 49, rule = B3/S23 10b2obo21bob2o$14bo3bo11bo3bo$10bo7b2o9b2o7bo$11b2ob2o2bo11bo2b2ob2o$ 15bo2b2ob2o3b2ob2o2bo$14b2o7bobo7b2o$15bo3bo9bo3bo$20bob2ob2obo3$obo 43bobo$o2bo17b3ob3o17bo2bo$3bo41bo$o21bo3bo21bo$bobobo16bo3bo16bobobo$ 3b4o14b3ob3o14b4o3$b4o17bo3bo17b4o$2bobobo14bobobobo14bobobo$7bo13bobo bobo13bo$4bo6bo3bo3b2o2bobo2b2o3bo3bo6bo$4bo2bo3bob3o2bo4bobo4bo2b3obo 3bo2bo$5bobo3bo3bo3b4o3b4o3bo3bo3bobo2$5bobo3bo3bo3b4o3b4o3bo3bo3bobo$ 4bo2bo3bob3o2bo4bobo4bo2b3obo3bo2bo$4bo6bo3bo3b2o2bobo2b2o3bo3bo6bo$7b o13bobobobo13bo$2bobobo14bobobobo14bobobo$b4o17bo3bo17b4o3$3b4o14b3ob 3o14b4o$bobobo16bo3bo16bobobo$o21bo3bo21bo$3bo41bo$o2bo17b3ob3o17bo2bo $obo43bobo3$20bob2ob2obo$15bo3bo9bo3bo$14b2o7bobo7b2o$15bo2b2ob2o3b2ob 2o2bo$11b2ob2o2bo11bo2b2ob2o$10bo7b2o9b2o7bo$14bo3bo11bo3bo$10b2obo21b ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 2 ZOOM 8 WIDTH 600 HEIGHT 600 GPS 6 LOOP 12 ]]
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RLE: here Plaintext: here


  1. Adam P. Goucher. "Haul". Catagolue. Retrieved on August 12, 2016.
  2. Apple Bottom (August 12, 2016). Re: Soup search results (discussion thread) at the forums
  3. dani (September 8, 2021). Re: Soup search results (discussion thread) at the forums
  4. BlinkerSpawn (August 12, 2016). Re: Soup search results (discussion thread) at the forums
  5. GUYTU6J (February 5, 2020). Re: Thread for your unsure discoveries (discussion thread) at the forums

External links