Spark coil

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Spark coil
2o4b2o$obo2bobo$2bo2bo2b$obo2bobo$2o4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Oscillator type Babbling brook
Number of cells 18
Bounding box 8×5
Frequency class 24.0
Period 2
Mod 2
Heat 2
Volatility 0.10
Strict volatility 0.10
Rotor type Orthogonal on-off
Discovered by Unknown
Year of discovery 1971

The spark coil is a period-2 oscillator found in 1971.[1][2] Despite its name, it does not produce sparks; however, the rotor resembles an electric spark.

Welded together with minimal separating stators, it can be extended indefinitely along its axis, so that it is the first in a series that continues with the piston and the long piston. It can also be arranged in two directions, as shown at Agar#Tile_agars.


Spark coil is the eleventh most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than the figure eight but more common than the mold.[3] It is the eleventh most common oscillator on Adam P. Goucher's Catagolue.

In even orthogonal symmetries (D2_+2, D4_+2, D4_+4, D8_4), it is the sixteenth to twentieth most common object, fourth to sixth most common oscillator, and fourth most common period-2 oscillator.

Glider synthesis

All strict still lifes with a population of 20 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

See also


  1. Robert Wainwright (September 1971). Lifeline, vol 3, page 3.
  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

  • 18P2.28 at Heinrich Koenig's Game of Life Object Catalogs