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Rephaser or Repather is a reaction found by Peter Raynham in 1973 that shifts the phase and path of a pair of gliders.[1] The reaction involves a block catalyzing the evolution of an interchange predecessor, reflecting both gliders by 90 degrees.

x = 20, y = 13, rule = B3/S23 2bo14bo$obo14bobo$b2o14b2o9$9b2o$9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 2 GPS 8 ZOOM 20 Y 3 LOOP 72 ]]
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RLE: here Plaintext: here

There is another form of this reaction, glider-block cycle, that reflects the gliders 180 degrees.

More generally, any mechanism that changes the phase and path of a glider or spaceship may be referred to as a rephaser, especially any reflector (A) that makes a glider arrive on a different time compared with reflecting with reflector B. For example, in the process of constructing and reducing the original period-52 glider gun, two bumpers in a 180-degree turn can be used as a rephaser to get a glider stream of repeat time 52 to the same place that two Snarks could, but arriving at a time impossible to do with the Snark.

See also


  1. Robert Wainwright (March 1973). Lifeline, vol 9, page 2.

External links