Block on cover

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Block on cover
x = 5, y = 5, rule = B3/S23 2ob2o$2obo$3bo$3o$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life
Pattern type Strict still life
Number of cells 12
Bounding box 5×5
Frequency class 19.9
Discovered by Unknown
Year of discovery Unknown

Block on cover is a 12-bit still life. It consists of a block stabilizing a cover.


Block and two tails is the fifty-sixth most common still life in Achim Flammenkamp's census, being less common than trans-hook and R-bee but more common than cis-boat on dock.[1] It is also the sixty-nineth most common object on Adam P. Goucher's Catagolue.[2]


On April 4, 2007 Dean Hickerson found a 4-glider synthesis of this still life.[3]

See also


  1. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
  3. Dean Hickerson's 2, 3, and 4-glider syntheses pattern collection

External links