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A relay is an oscillator in which spaceships (typically gliders) travel in a loop. The simplest example is the p60 glider shuttle shown below using two pentadecathlons. Pulling the pentadecathlons further apart allows any period of the form 60 + 120n to be achieved. This is the simplest proof of the existence of oscillators of arbitrarily large period.

x = 35, y = 7, rule = B3/S23 2bo4bo$2ob4ob2o$2bo4bo$16bo$17b2o8bo4bo$16b2o7b2ob4ob2o$27bo4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ WIDTH 800 THUMBSIZE 2 ZOOM 18 GPS 5 AUTOSTART ]]
pentadecathlon relay (p60 glider shuttle)
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RLE: here Plaintext: here

See also

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