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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 ]]
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

R2-D2 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.[1]

Elkies' R2-D2 stator from 1994 (which inspired the name)

Goldtiger997 found a 86-glider synthesis for this oscillator on March 7, 2020.[2]

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Goldtiger997 (March 7, 2020). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums

External links

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