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6b2o4b$6b2o4b2$4b4o4b$2obo4bo3b$2obo2bobo3b$3bo3b2ob2o$3bobo2bob2o$4b 4o4b2$4b2o6b$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 4 0 0 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Oscillator type Billiard table
Family Pinwheel
Number of cells 35
Bounding box 12×12
Period 4
Mod 1
Heat 4.0
Volatility 0.20
Strict volatility 0.20
Discovered by Simon Norton
Year of discovery 1970

Pinwheel (or Catherine wheel[1]) is a period-4 oscillator found by Simon Norton in April 1970.[2] It is a billiard table configuration and possibly the first period 4 oscillator discovered. Later, another billiard table clock 2 was found, which has the same stator as pinwheel.

On April 22, 2016, Martin Grant provided a glider synthesis for this oscillator. Using the same precursor, the two routes to pinwheel and clock 2 diverge in the middle.[3]

See also


  1. "Catherine wheel". The Life Lexicon. Stephen Silver. Retrieved on December 3, 2018.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. Martin Grant (April 22, 2016). Re: Synthesising Oscillators (discussion thread) at the forums

External links

  • 35P4.10 at Heinrich Koenig's Game of Life Object Catalogs