Space rake

From LifeWiki
Jump to navigation Jump to search
Space rake
x = 22, y = 19, rule = B3/S23 11b2o5b4o$9b2ob2o3bo3bo$9b4o8bo$10b2o5bo2bo2$8bo$7b2o8b2o$6bo9bo2bo$7b 5o4bo2bo$8b4o3b2ob2o$11bo4b2o4$18b4o$o2bo13bo3bo$4bo16bo$o3bo12bo2bo$b 4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 14 AUTOSTART OFF ]]
Pattern type Rake
Number of cells 65
Bounding box 22 × 19
Direction Orthogonal
Period 20
Speed c/2
Discovered by Unknown
Year of discovery Unknown

Space rake is a period 20 forward glider rake constructed no later than 1971,[1] probably by Bill Gosper; it was the first known rake. It consists of an ecologist with a lightweight spaceship added to turn its dying debris into gliders.

Note that if the back lightweight spaceship is flipped vertically and moved down by one cell, then this becomes a period 20 backward glider rake, as shown below.[2]


x = 23, y = 20, rule = b3/s23 12b2o5b4o$10b2ob2o3bo3bo$10b4o8bo$11b2o5bo2bob2$9bo13b$8b2o8b2o3b$7bo 9bo2bo2b$8b5o4bo2bo2b$9b4o3b2ob2o2b$12bo4b2o4b4$19b4o$18bo3bo$b4o17bo$ o3bo13bo2bob$4bo18b$o2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]
The backward version of the space rake
(click above to open LifeViewer)
RLE: here Plaintext: here


  1. Robert Wainwright (September 1971). Lifeline, vol 3, page 7.
  2. Alan Hensel's pattern collection.

External links