Spiral
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| Spiral | |||||||||
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| 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 one of the two smallest still lifes with four-fold rotational (C4) symmetry. It consists of a tub and four tails. It was found by Robert Wainwright in 1971.[1][2]
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
- 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