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3bo3b$b3o3b$o5bo$ob5o$bo5b$4bo2b$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 2 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Family Beacon
Number of cells 16
Bounding box 7×7
Frequency class 32.5
Period 2
Mod 2
Heat 2
Volatility 0.11
Strict volatility 0.11
Rotor type Diagonal on-off
Discovered by Unknown
Year of discovery Unknown
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21P2 is a period-2 oscillator.


21P2 is about the thirty-eighth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than boat on spark coil and block on griddle, about as common as the fore and back, and more common than trans-block on long hook eating tub and trans-beacon down on long hook.[1]


  1. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.

External links

  • 16P2.91 at Heinrich Koenig's Game of Life Object Catalogs