Grin

Grin is a common parent of the block. Its name derives from the Cheshire cat, an 18-cell six-tick grin predecessor created by C. R. Tompkins that appeared unaccountably both in Scientific American and in Winning Ways.

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Cheshire cat, leaving a block as its pawprint
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Grin
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Pattern type Miscellaneous
Number of cells 4
Bounding box 4×2
Discovered by Unknown
Year of discovery 1970

In other rules
Moon moving

Grin is a common lightspeed spaceship in many Life-like cellular automata, for example Seeds and Live Free or Die. It is the third most common spaceship in the former, where it is known as moon. In isotropic non-totalistic cellular automata, it works from B2ae/S to B23-j45678/S01e2-k345678.

The pattern also appears as a c/2 orthogonal spaceship in some B0 rules,[which?] interestingly keeping the same appearance in all phases.

gollark: Yes!
gollark: They can also move light, ME connections, liquids and items.#
gollark: Also the past, since you can set them to move time now.
gollark: P2P tunnels are the future!
gollark: Yes, obviously!

See also
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