Light bulb

Light bulb is a period-2 oscillator that was found in 1971.[1] Its rotor, known as the filament,[2] 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.[3] 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 for the resulting oscillator) though these lead to larger bounding boxes.

Light bulb
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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

The first soup-based syntheses for this oscillator were discovered by Mark Niemiec on December 17, 2004 based on results from Andrzej Okrasinski's census, costing 11 gliders for the house-stabilized version and 16 for the bookend-stabilized version.[4]

A variant of the light bulb that is 2 cells smaller.
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References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. "Game of Life Dictionary". Pentadecathlon.com. Retrieved on 2016-10-02.
  3. "Period 2 Oscillator Rotors". Retrieved on March 16, 2009.
  4. Jason Summers' jslife pattern collection. Retrieved on January 5, 2020.
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