Eater plug

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Eater plug
o$3o$3bo$2bo$2bo2bo$3b2obo$6bo$6b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 2 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 14
Bounding box 8 × 8
Frequency class 34.1
Period 2
Mod 2
Heat 2
Volatility 0.13
Strict volatility 0.13
Rotor type Diagonal on-off
Discovered by Robert Wainwright
Year of discovery 1973

Eater plug (or cavity[1]) is an extensible period-2 oscillator that was found in February 1973 by Robert Wainwright.[2] Its name derives from its resemblance to two diagonally-touching eater 1s.

It has an identical rotor and bushing to the great on-off, which is interestingly over 3000 times more common than it despite its size.


Eater plug is about the fifty-fifth most common naturally-occurring oscillator in Achim Flammenkamp's census[3] and the 57th most common oscillator on Adam P. Goucher's Catagolue.

Glider synthesis

All strict still lifes with a population of 21 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 31 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.


  1. "Cavity". The Life Lexicon. Stephen Silver.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.

External links