Smiley
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Smiley  
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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 in July 1994 and named by Alan Hensel.
In November 1994 Mark Niemiec noticed that its sparks can interact in boring, but nontrivial ways with other oscillators, optionally creating oscillators of higher periods.^{[1]}
Synthesis
A 28glider synthesis for it was discovered in January 2008 by Jason Summers.^{[2]} In August 2015 Matthias Merzenich proposed an 8glider synthesis based on a soup found by Adam P. Goucher using distributed apgsearch.^{[3]}
Commonness
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.^{[4]}
Image gallery
References
 ↑ Mark Niemiec (November 1, 1994). "More straw". Retrieved on October 8, 2015.
 ↑ H. Koenig. "Oscillator Construction". Game of Life News. Retrieved on May 2, 2009.
 ↑ Matthias Merzenich (August 8, 2015). "Re: Soup search results". Retrieved on September 18, 2015.
 ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
External links
 Smiley at the Life Lexicon
 17P8.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Patterns with Catagolue frequency class 42.4
 Oscillators with 17 cells
 Patterns with 17 cells
 Patterns found by Achim Flammenkamp
 Patterns found in 1994
 Patterns that can be constructed with 8 gliders
 Oscillators
 Periodic objects with minimum population 17
 Oscillators with period 8
 Oscillators with mod 4
 Oscillators with heat 22
 Oscillators with volatility 1.00
 Oscillators with strict volatility 1.00
 Patterns with bilateral orthogonal symmetry
 Flipping oscillators
 Sparkers
 Sparkers with period 8
 Moderate sparkers
 Dot sparkers