Spiral
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Spiral | |||||||||
View static image | |||||||||
Pattern type | Strict still life | ||||||||
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Number of cells | 20 | ||||||||
Bounding box | 7 × 7 | ||||||||
Discovered by | Robert Wainwright | ||||||||
Year of discovery | 1971 | ||||||||
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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
- ↑ Robert Wainwright (June 1971). Lifeline, vol 2.
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
External links
- Spiral at the Life Lexicon
- Spiral at Adam P. Goucher's Catagolue
- Twenty-Bit Life Objects at Mark D. Niemiec's Life Page
Categories:
- Patterns
- Periodic objects with minimum population 20
- Patterns with 20 cells
- Patterns found by Robert Wainwright
- Patterns found in 1971
- Patterns that can be constructed with 10 gliders
- Still lifes
- Strict still lifes
- Strict still lifes with 20 cells
- Patterns with 90-degree rotation symmetry
- Semi-natural periodic objects