Shuriken
| Shuriken | |||||||||
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| Pattern type | Strict still life | ||||||||
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| Number of cells | 20 | ||||||||
| Bounding box | 7 × 7 | ||||||||
| Static symmetry | rc (C4_1) | ||||||||
| Discovered by | Unknown | ||||||||
| Year of discovery | Unknown | ||||||||
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The shuriken is a 20-cell still life with C4_1 rotational symmetry. It is one of the two smallest strict still lifes with 4-fold rotational symmetry, along with spiral.
Reactions
If a single cell is turned on in a specific place around one of the hooks, a shuriken can collapse into an iron and trans-table (Catagolue: here), like so:
| A shuriken turns into a 19-cell still life when sparked (click above to open LifeViewer) RLE: here Plaintext: here |
This reaction was once used in the best synthesis for the resulting still life, but has since been superseded by a component-based synthesis.
Glider synthesis
All strict still lifes with a population of 23 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 35 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.
Occurrence
- See also: List of common still lifes
It is the thirty-fifth most common object in C4_1 symmetry on Catagolue.
This pattern has occurred naturally in Catagolue's asymmetric censuses, however details of its rarity are currently not known.
See also
External links
- Shuriken at Adam P. Goucher's Catagolue
- The 112243 twenty-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 20/20-21877.rle)
- Shuriken at Wikipedia (name origin)