Octagon 4

From LifeWiki
Jump to navigation Jump to search
Octagon 4
7b2o$7b2o2$6b4o$5bo4bo$4bo6bo$3bo8bo$2obo8bob2o$2obo8bob2o$3bo8bo$4bo 6bo$5bo4bo$6b4o2$7b2o$7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 3 GPS 4 ZOOM 24 HEIGHT 500 WIDTH 600 ]]
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 period-4 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 34-glider synthesis of this oscillator,[2] which was improved to 18 gliders by Jeremy Tan on May 17, 2019.[3]

It first appeared semi-naturally in October 2014 in a soup found by Matthias Merzenich using apgsearch.[4] Almost exactly 3 in 100000 (within the margin of error) even-width eightfold (D8_4) symmetric soups will form an octagon 4 in the centre.

Without the blocks, the octagon will become 4 ponds.

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Jason Summers' jslife pattern collection.
  3. Jeremy Tan (May 17, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  4. Matthias Merzenich (October 2, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums

External links

  • 40P4.19 at Heinrich Koenig's Game of Life Object Catalogs