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A cylinder, as it applies to Life, usually refers to a semi-infinite Life universe that takes the form of a strip n cells wide (or high) and infinitely long. It may be visualized as a cylinder of circumference n, gotten by taking opposite edges of the strip as neighbors. It is the structure on which second stage de Bruijn diagrams are defined. X acts as a torus, whereas Y acts as a plane.

x = 3, y = 3, rule = B3/S23:T0,7 b2o$obo$2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 7 TRACKLOOP 28 1/4 0 ]]
A glider traveling across a cylindrical universe
(click above to open LifeViewer)
RLE: here Plaintext: here

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