Quad
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Quad  
View animated image  
View static image  
Pattern type  Oscillator  

Oscillator type  Muttering moat  
Family  Barberpole  
Number of cells  16  
Bounding box  6×6  
Period  2  
Mod  1  
Heat  8  
Volatility  0.40  
Strict volatility  0.40  
Rotor type  Clock  
Discovered by  Robert Kraus  
Year of discovery  1971  
 
 
 

Quad (or barberpole intersection^{[1]}) is a period2 oscillator and muttering moat that was found in April 1971 by Robert Kraus.^{[2]} It has the same rotor as the clock. It and mold are the only flippers that fit inside a 6×6 bounding box; however, mold is period 4.
This oscillator first occurred naturally on December 28, 2015, in a soup submitted to Catagolue by Adam P. Goucher. A 12glider synthesis was constructed the next day by Tanner Jacobi.^{[3]}
See also
References
 ↑ Eric Weisstein. "Quad". Eric Weisstein's Treasure Trove of Life. Retrieved on May 1, 2009.
 ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
 ↑ Tanner Jacobi (December 29, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
External links
 Quad at the Life Lexicon
 Quad at Adam P. Goucher's Catagolue
 16P2.19 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Oscillators with 16 cells
 Patterns with 16 cells
 Patterns found by Robert Kraus
 Patterns found in 1971
 Patterns that can be constructed with 10 gliders
 Oscillators
 Periodic objects with minimum population 16
 Barberpole variants
 Muttering moats
 Oscillators with period 2
 Oscillators with mod 1
 Oscillators with heat 8
 Oscillators with volatility 0.40
 Oscillators with strict volatility 0.40
 Oscillators with rotor Clock
 Patterns with 90degree rotation symmetry
 Flipping oscillators
 Natural periodic objects