Light bulb

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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, though these lead to larger bounding boxes.

An 7-glider synthesis is known for a stator variant of this oscillator which uses a house instead of a snake for stabilization.[3]

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-C". Catagolue. Retrieved on May 24, 2019.

External links