PD-pair reflector

PD-pair reflector is a pair of pentadecathlons arranged so that their V sparks turn a glider by 90 degrees with a repeat time of 45 ticks. This reaction was found by Mark Niemiec on 6 January 1996, which is relatively recent considering how old pentadecathlon technology is.

Six other arrangements of two pentadecathlons serves as a 180-degree glider reflector, as is demonstrated in 6 bits. Both reflection involves turning a glider into a block, and then that block into a glider.

x = 45, y = 30, rule = B3/S23 43bo$42bo$42b3o9$14b3o2$13bo3bo$13bo3bo2$14b3o3$14b3o2$13bo3bo$13bo3bo $20bo$14b3o3bobo$20b2o2$o2bob2obo2bo$4ob2ob4o$o2bob2obo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 X -7 Y 10 Z 14 HEIGHT 480 GPS 15 AUTOSTART LOOP 90 ]]

(click above to open LifeViewer) RLE: here Plaintext: here

External links

• PD-pair reflector at the Life Lexicon