Octagon 4
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Octagon 4  
View animated image  
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Pattern type  Oscillator  

Number of cells  40  
Bounding box  16×16  
Period  4  
Mod  4  
Heat  48  
Volatility  0.83  
Strict volatility  0.67  
Discovered by  Robert Wainwright  
Year of discovery  1979  
 
 
 

Octagon 4 is a period4 oscillator, discovered in January 1979 by Robert Wainwright.^{[1]} It consists of a regular octagon with sides four cells long and of four blocks. In August 2004 Jason Summers and Mark Niemiec found a 34glider synthesis of this oscillator,^{[2]} which was improved to 18 gliders by Jeremy Tan on May 17, 2019.^{[3]}
It first appeared seminaturally in October 2014 in a soup found by Matthias Merzenich using apgsearch.^{[4]} Almost exactly 3 in 100000 (within the margin of error) evenwidth eightfold (D8_4) symmetric soups will form an octagon 4 in the centre.
Without the blocks, the octagon will become 4 ponds.
See also
References
 ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
 ↑ Jason Summers' jslife pattern collection.
 ↑ Jeremy Tan (May 17, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
 ↑ Matthias Merzenich (October 2, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
External links
 Octagon 4 at the Life Lexicon
 40P4.19 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Oscillators with 40 cells
 Periodic objects with minimum population 40
 Patterns with 40 cells
 Patterns found by Robert Wainwright
 Patterns found in 1979
 Patterns that can be constructed with 18 gliders
 Oscillators
 Oscillators with period 4
 Oscillators with mod 4
 Oscillators with heat 48
 Oscillators with volatility 0.83
 Oscillators with strict volatility 0.67
 Patterns with complete square symmetry
 Seminatural periodic objects