Beacon
Beacon  
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Pattern type  Oscillator  

Oscillator type  Babbling brook  
Family  Beacon  
Number of cells  6  
Bounding box  4×4  
Frequency class  8.8  
Period  2  
Mod  2  
Heat  2  
Volatility  0.25  
Strict volatility  0.25  
Rotor type  Diagonal onoff  
Discovered by  John Conway  
Year of discovery  1970  
 
 
 

The beacon is a common period 2 oscillator, composed of two diagonally touching blocks. It was found by John Conway in March 1970.
The beacon is the simplest onoff. Its rotor, known as diagonal onoff, can be supported by several different stators: the two nextsmallest are seen in eater plug, mangled 1 beacon and 21P2.
A beacon in the right phase can trigger the boatbit reaction.
It can, in some sense, be considered a billiard table.^{[1]}
Commonness
The beacon is the third most common oscillator in Achim Flammenkamp's census (after the blinker and toad).^{[2]} It is also the thirteenth most common object on Adam P. Goucher's Catagolue.^{[3]}
In other rules
tlife and its related rules have the transition 4q, making beacon an 8cell still life systematically named "blocktie".
See also
References
 ↑ Dave Greene. Re: Thread for basic questions (discussion thread) at the ConwayLife.com forums
 ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
 ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
External links
 Beacon at the Life Lexicon
 6P2.2 at Heinrich Koenig's Game of Life Object Catalogs
 Patterns
 Patterns with Catagolue frequency class 8.8
 Natural periodic objects
 Oscillators with 6 cells
 Patterns with 6 cells
 Patterns found by John Conway
 Patterns found in 1970
 Patterns that can be constructed with 3 gliders
 Oscillators
 Periodic objects with minimum population 6
 Beacon variants
 Babbling brooks
 Oscillators with period 2
 Oscillators with mod 2
 Oscillators with heat 2
 Oscillators with volatility 0.25
 Oscillators with strict volatility 0.25
 Oscillators with rotor Diagonal onoff
 Patterns with rectangular diagonal symmetry
 Eaters