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x = 7, y = 7, rule = B3/S23 3ob3o$bobobo2$bo3bo2$obobobo$2bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 8 GPS 4 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 17
Bounding box 7×8
Frequency class 42.4
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 on July 17, 1994[1] 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.[2]


A 28-glider synthesis for it was discovered in October 2007 by Jason Summers.[3] In November 2014, Martin Grant posted an 11-glider synthesis based on a symmetric soup found by Ivan Fomichev using apgsearch.[4] In August 2015, Matthias Merzenich posted an 8-glider synthesis based on the first asymmetric soup, found by Adam P. Goucher.[5][6]


On Catagolue, it is the fourth most common period 8 oscillator, being less common than Coe's p8 but slightly more common than Achim's p8.[7]

Image gallery

Generation 2 reveals the reason for smiley's name


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Mark Niemiec (November 1, 1994). "More straw". Retrieved on October 8, 2015.
  3. Jason Summers' jslife pattern collection. Retrieved on January 5, 2020.
  4. Martin Grant (November 28, 2014). Re: Soup search results (discussion thread) at the forums
  5. Matthias Merzenich (August 1, 2015). "Re: Soup search results". Retrieved on September 18, 2015.
  6. Martin Grant (July 31, 2015). Re: Soup search results (discussion thread) at the forums
  7. Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.

External links

  • 17P8.1 at Heinrich Koenig's Game of Life Object Catalogs