Spiral

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Spiral
x = 7, y = 7, rule = B3/S23 2o4bo$bo2b3o$bobo$2bobo$3bobo$3o2bo$o4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]]
Pattern type Strict still life
Number of cells 20
Bounding box 7 × 7
Discovered by Robert Wainwright
Year of discovery 1971

Spiral (or tub with four tails) is a still life consisting of a tub with four tails. It was found by Robert Wainwright in 1971.[1][2] It is one of the two smallest still lifes with strict four-fold rotational (C4) symmetry, the other being shuriken.

Glider synthesis

All strict still lifes with a population of 21 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 31 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

References

  1. Robert Wainwright (June 1971). Lifeline, vol 2.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.

External links