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Smiley image
Pattern type Oscillator
Number of cells 17
Bounding box 7×8
Period 8
Mod 4
Heat 22.5
Volatility 1.00
Strict volatility 1.00
Discovered by Achim Flammenkamp
Year of discovery 1994

Smiley is a period 8 oscillator that was found by Achim Flammenkamp in July 1994 and named by Alan Hensel.

In November 1994 Mark Niemiec noticed that its sparks can interact in boring, but non-trivial ways with other oscillators, optionally creating oscillators of higher periods.[1]

A 28-glider synthesis for it was discovered in January 2008 by Jason Summers.[2] In August 2015 Matthias Merzenich proposed an 8-glider synthesis based on a soup found by Adam P. Goucher using distributed apgsearch.[3]

Image gallery

Generation 2 reveals the reason for smiley's name


  1. Mark Niemiec (November 1, 1994). "More straw". Retrieved on October 8, 2015.
  2. H. Koenig. "Oscillator Construction". Game of Life News. Retrieved on May 2, 2009.
  3. Matthias Merzenich (August 8, 2015). "Re: Soup search results". Retrieved on September 18, 2015.

External links

  • Smiley at Eric Weisstein's Treasure Trove of Life