Octagon 2

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Octagon 2
3b2o3b$2bo2bo2b$bo4bob$o6bo$o6bo$bo4bob$2bo2bo2b$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 16
Bounding box 8×8
Frequency class 29.3
Period 5
Mod 5
Heat 16
Volatility 0.80
Strict volatility 0.80
Discovered by Arthur Taber
Sol Goodman
Year of discovery 1971

Octagon 2 was the first known period 5 oscillator, discovered in 1971 independently by Sol Goodman and Arthur Taber; the name is due to the latter. Its discovery was first reported in Lifeline Volume 1.

In December 2014, forum user flipper77 discovered that four pre-traffic lights could hassle the octagon, turning it into a period 4 oscillator.[1]


Octagon 2 is about the twenty-sixth most common naturally-occurring oscillator in Achim Flammenkamp's census, being about as common as unix.[2] On Catagolue, it is the most common period 5 oscillator, being more common than fumarole.[3]

See also


  1. Cite error: Invalid <ref> tag; no text was provided for refs named post15094
  2. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.

External links

  • 16P5.1 at Heinrich Koenig's Game of Life Object Catalogs