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3b2ob$2bo2bo$o2bobo$4bob$ob2o2b$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 4 0 0 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 12
Bounding box 6×6
Frequency class 24.2
Period 4
Mod 2
Heat 7
Volatility 0.63
Strict volatility 0.53
Discovered by Achim Flammenkamp
Year of discovery 1988

Mold was found by Achim Flammenkamp in 1988, but not widely known until Dean Hickerson rediscovered it (and named it) in August 1989; compare with jam. In terms of its minimum population of 12 it ties with mazing as the smallest period 4 oscillator, but in terms of its 6×6 bounding box it wins outright. In fact, of all oscillators that fit in a 6×7 box it is the only one with period greater than 2. Its spark can support other patterns, such as “butter”.

It has a similar rotor to mazing.


Mold is the twelfth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than the spark coil but more common than the quadpole on ship.[1] On Catagolue, it is the most common period 4 oscillator, being more common than mazing.[2]

See also


  1. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  2. Adam P. Goucher. "Census". Catagolue. Retrieved on October 27, 2018.

External links

  • 12P4.1 at Heinrich Koenig's Game of Life Object Catalogs