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x = 4, y = 2, rule = B3/S23 o2bo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Miscellaneous
Number of cells 4
Bounding box 4×2
Discovered by Unknown
Year of discovery 1970

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.[citation needed]

x = 6, y = 6, rule = B3/S23 bo2bo$b4o$o4bo$ob2obo$o4bo$b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 2 GPS 4 PAUSE 1 LOOP 15 ]]
Cheshire cat, leaving a block as its pawprint
(click above to open LifeViewer)
RLE: here Plaintext: here

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 such as B0123/S6, interestingly keeping the same appearance in all phases.

See also

External links