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A bumper is any one of several periodic color-preserving glider reflectors, most of which were discovered by Tanner Jacobi on 6 April 2016.[1] The theoretical lowest repeat time is 34 ticks, but this can not be achieved in practice by currently known bumper variants.

At gen 11 or 12, a spark is needed. A dot spark can be used on gen 11 (such as from the blocker). The spark from the grin (such as from the Coe's p8) at gen 12 can also work; at gen 20, a glider an R-pentomino is produced. The glider escapes, and the R is converted back to a loaf using an eater 1.

x = 20, y = 44, rule = B3/S23 13bo$13bobo$13b2o2$11b2o$4b2o4bo2bo$4b2o5bobo$4b2o6bo$5bo$4bobo9b2o$3b 2obo9bo$17b3o$19bo$4b2o$4b2o14$13bo$13bobo$13b2o2$5b2o4b2o$5b2o3bo2bo$ 11bobo$12bo$5bo$4b3o9b2o$2b2ob2o9bo$bo2bo12b3o$4bo14bo2$o2bo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 2 GPS 7 ZOOM 10 HEIGHT 800 PAUSE 2 T 11 PAUSE 2 T 12 PAUSE 2 T 20 PAUSE 2 LOOP 41 ]]
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RLE: here Plaintext: here

A p2 bumper, if discovered, would provide non-trivial oscillators for periods 34 and 38 which are currently unknown as of January 2019, and a stable one would presumably allow for a period 41 oscillator.

See also


  1. Tanner Jacobi (April 6, 2016). Re: Thread For Your Accidental Discoveries (discussion thread) at the ConwayLife.com forums

External links