R2D2

R2D2
x = 11, y = 10, rule = B3/S23 5bo$4bobo$3bobobo$3bobobo$2obo3bob2o$2obo3bob2o$3bo3bo$3bobobo$4bobo$ 5bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 4 ZOOM 20 LOOP 8 ]]
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Pattern type	Oscillator
Oscillator type	Billiard table
Number of cells	29
Bounding box	11×10
Period	8
Mod	4
Heat	2.0
Volatility	0.22
Strict volatility	0.22
Discovered by	Peter Raynham
Year of discovery	Unknown
Rules Outer-totalistic rules B3/S23 – B378/S0235678 Important rules Conway Life # of rules 27 = 128 Isotropic rules B3eiy/S2cik3-jknq – B2kn34-aejn5-jry6-ik78/S01c234-n5678
Glider synthesis Fewest gliders 57 (32†) Catagolue-generated RLE r2d2_synth.rle †Can be constructed with 32 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext r2d2.cells RLE r2d2.rle
Identifiers apgcode xp8_gg0s252s0ggz11078m87011 Pentadecathlon ID 29P8.2

R2D2 is a period-8 oscillator that was found in the form shown in the infobox at right, but not named, by Peter Raynham in the early 1970s. The name derives from a form with a larger and less symmetric stator discovered later by Noam Elkies in August 1994, shown below.

Elkies' R2D2 stator from 1994 (which inspired the name)

Goldtiger997 found a 86-glider synthesis for this oscillator on March 7, 2020.

See also

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External links

• R2D2 at the Life Lexicon

• R2D2 at Adam P. Goucher's Catagolue

• 29P8.2 at Heinrich Koenig's Game of Life Object Catalogs