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
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 4, y = 2, rule = B3/S23 o2bo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] <nowiki></nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
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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: Maybe I should see about training an automatic irony detector.
gollark: The UK, as a superior country, has fixed this by not having guns.
gollark: If you experience genocide, it's your fault, for not being smart enough, naturally.
gollark: Idea: remove people who want some people to not be in the gene pool from the gene pool.
gollark: This is sensible, as environmental factors and/or compassion do not exist.

See also
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