Light bulb

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Revision as of 17:20, 16 July 2019 by Ian07 (talk | contribs) (Bookend variant is mentioned in first paragraph, so merged synthesis info into there)
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Light bulb
x = 7, y = 9, rule = B3/S23 b2obo$bob2o2$2b3o$bo3bo$bo3bo$2bobo$obobobo$2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 ZOOM 20 LOOP 2 ]]
Pattern type Oscillator
Oscillator type Babbling brook
Billiard table
Number of cells 23
Bounding box 7×9
Period 2
Mod 2
Heat 3
Volatility 0.12
Strict volatility 0.12
Rotor type Filament
Discovered by Unknown
Year of discovery 1971

Light bulb is a period 2 oscillator that was found in 1971. Its rotor, known as the filament,[1] is the only known 3-cell period 2 rotor, and it can be embedded in a slightly smaller stator, giving the 21-cell variant shown below. Two other variants of this oscillator are also known.[2] Various other small induction coils can also be used in place of the snake at the top of the bulb, including house and bookend, (the latter of which has a known 6-glider synthesis[3]) though these lead to larger bounding boxes.

Image gallery

A variant of the light bulb that is 2 cells smaller.


  1. "Game of Life Dictionary". Retrieved on 2016-10-02.
  2. "Period 2 Oscillator Rotors". Retrieved on March 16, 2009.
  3. Adam P. Goucher. "lightbulb_and_cis-hook". Catagolue. Retrieved on July 16, 2019.

External links