Domino

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Domino
2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ZOOM 64 GPS 1 PAUSE 2 LOOP 4 ]]
Pattern type Spark
Number of cells 2
Bounding box 2×1
Discovered by John Conway
Year of discovery 1969

A domino is two cells connected orthogonally. The only possible 2-cell polyomino, it most commonly arises as a spark, in which case it is referred to as a domino spark.

Domino sparks are arguably the most common type of spark of all, as they arise as the last living state of larger sparks such as the banana spark (and therefore cavity), V spark (and therefore the phi spark and table).

Production of dominoes as sparks

Domino sparks can either be produced parallel or perpendicular to an oscillator's bounding box. Parallel cases are the most common, with heavyweight emulators and volcanoes being producers of them. Perpendicular cases are referred to as pipsquirters.

They are also notably produced by the heavyweight spaceship.

Use in oscillators

The squaredance agar is entirely comprised of dominoes.

See also