Stable Reflector

Above is the fastest known stable reflector, built by Dean Hickerson using parts by Paul Callahan and David Buckingham. One glider enters and five exit along different paths, leaving the construction precisely as found. Any stream of gliders on the appropriate diagonal can be reflected by this pattern, provided that each enters at least 747 generations after its predecessor.

Chronology

generation 0: glider
generation 170: glider + r-pentomino + beehive
generation 257: glider + Herschel + beehive
generation 334: 2 gliders + Herschel + beehive
generation 398: 3 gliders + Herschel + beehive
generation 462: 3 gliders + Herschel + beehive
generation 539: 3 gliders + Herschel + beehive
generation 616: 4 gliders + Herschel + beehive
generation 689: 6 gliders + beehive
generation 751: 5 gliders.


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