Space rake

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Space rake
Space rake image
Pattern type Rake
Direction Orthogonal
Period 20
Speed c/2
Number of cells 65
Bounding box 22×19
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

  • Space rake at Eric Weisstein's Treasure Trove of Life