Space rake

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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 around 1971, 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.[1]

Image gallery

The backward version of the space rake
RLE: here


  1. Alan Hensel's pattern collection.

External links