Block on cover
| Block on cover | |||||||||
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| Pattern type | Strict still life | ||||||||
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| Number of cells | 12 | ||||||||
| Bounding box | 5 × 5 | ||||||||
| Frequency class | 19.9 | ||||||||
| Static symmetry | / (D2_x) | ||||||||
| Discovered by | Robert Wainwright Everett Boyer | ||||||||
| Year of discovery | 1973 | ||||||||
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Block on cover is a 12-cell still life consisting of a block stabilizing a cover.
Commonness
- Main article: List of common still lifes
Block on cover is the fifty-sixth most common still life in Achim Flammenkamp's census, being less common than trans-bookend and bun but more common than cis-boat on dock.[1]
It is the 58th most common still life on Adam P. Goucher's Catagolue, being less common than eater head siamese eater tail but more common than cis-boat on dock. It is the 6th most common still life with 12 cells, being less common than eater head siamese eater tail but more common than cis-block on long bookend.[2]
The octo3obj database contains 22 collisions with block on cover occurring in the ash.
Construction
On April 4, 2007 Dean Hickerson found a 4-glider synthesis of this still life.[3]
A number of known alternate syntheses can be found in Mark Niemiec's database.[4]
| Several 4G syntheses[4][5] (click above to open LifeViewer) |
Gallery
| 4 queen bees hassling a block on cover into a loaf and back, forming a p30 oscillator, discovered by eRroR_606 on September 13, 2026 [6] (click above to open LifeViewer) Catagolue: here |
See also
References
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 5, 2023.
- ↑ 2, 3, and 4-glider syntheses on Dean Hickerson's Life page
- ↑ 4.0 4.1 The 121 twelve-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 12/12-111.rle)
- ↑ carson-cheng/4g-database on GitHub
- ↑ eRroR_606 (September 13, 2026). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
External links
- Block on cover at Adam P. Goucher's Catagolue
- 12.3 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Patterns with Catagolue frequency class 19
- Natural periodic objects
- Periodic objects with minimum population 12
- Patterns with 12 cells
- Patterns found by Robert Wainwright
- Patterns found by Everett Boyer
- Patterns found in 1973
- Patterns that can be constructed with 4 gliders
- Still lifes
- Strict still lifes
- Strict still lifes with 12 cells
- Strict still lifes with / symmetry