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x = 5, y = 4, rule = B3/S23 2bo$bobo$bobo$2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ ZOOM 60 ]]
Pattern type Strict still life
Number of cells 9
Bounding box 5 × 4
Frequency class 15.3
Discovered by Unknown
Year of discovery 1971
For other uses of 'Hat', see Hat (disambiguation).
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Hat is a 9-cell still life that was discovered independently in 1971 by several Life enthusiasts and named by Charles Corderman.[1][2]

The loop and eleven loop can be seen as the long and long long versions of the hat. Orthogonally lengthened versions of the hat are also possible still life components (a longlong3 version appears in Cthulhu), though they are not still lifes of their own.


As a rock

It (as well as similar still lifes such as mirrored table) can be used as an eater (in particular, a rock) stabilising a stator variant[Catagolue 1] of the twin bees shuttle. The mechanism has some similarities to snake-type eaters.

It also functions at the same orientation as the rock of a period-4 oscillator[Catagolue 2] with two mirrored 20P4 halves, one on either side of it. The unnamed region may also instead be supported by eaters[Catagolue 3] or mutually support ponds hassled at period-4, forming a D8_1-symmetrical tetramerisation.[Catagolue 4]


See also: List of common still lifes

Hat is the twenty-fifth most common still life in Achim Flammenkamp's census, being less common than trans-boat with tail but more common than boat tie ship.[3]

It is the 26th most common still life on Adam P. Goucher's Catagolue, being less common than boat tie ship but more common than very long ship. It is the 3rd most common still life with 9 cells, being less common than trans-boat with tail but more common than very long boat.[4]

Glider synthesis

All strict still lifes with a population of 21 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Robert Wainwright (June 1971). Lifeline, vol 2, page 3.
  3. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  4. Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 5, 2023.


External links