Bi-block: Difference between revisions
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The '''bi-block''' is a common formation of two [[block]]s and the smallest and most common [[pseudo still life]]. Similar pseudo still lifes can be formed by considering any rectangular array of blocks, and are referred to as (''m''-by-''n'') [[block array]]s. | The '''bi-block''' is a common formation of two [[block]]s and the smallest and most common [[pseudo still life]]. Similar pseudo still lifes can be formed by considering any rectangular array of blocks, and are referred to as (''m''-by-''n'') [[block array]]s. | ||
Bi-blocks can be hassled by [[spark]]s to create oscillators, such as the [[p18 bi-block hassler]] and [[four molds hassling eight blocks]]. | Bi-blocks can be hassled by [[spark]]s to create oscillators, such as the [[p18 bi-block hassler]] and [[four molds hassling eight blocks]]. A bait bi-block is also used in [[0-degree colour-preserving reflector (March 2023)|The newest 0-degree glider reflector]] | ||
== Commonness == | == Commonness == | ||
Revision as of 14:17, 14 October 2023
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| Pattern type | Pseudo still life | ||||||||
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| Number of cells | 8 | ||||||||
| Bounding box | 5 × 2 | ||||||||
| Static symmetry | Unspecified | ||||||||
| Discovered by | Unknown | ||||||||
| Year of discovery | 1970 | ||||||||
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The bi-block is a common formation of two blocks and the smallest and most common pseudo still life. Similar pseudo still lifes can be formed by considering any rectangular array of blocks, and are referred to as (m-by-n) block arrays.
Bi-blocks can be hassled by sparks to create oscillators, such as the p18 bi-block hassler and four molds hassling eight blocks. A bait bi-block is also used in The newest 0-degree glider reflector
Commonness
The bi-block is about ¼ as common as the pond, the most common 8-bit strict still life. Compared to other strict still lifes, it is more common than the ship-tie but less common than the long boat.[1] In odd orthogonal symmetries, bi-blocks are more common, as gliders in the same phase that collide in odd symmetry form a bi-block.
Counting both strict and pseudo still lifes, the tri-block is the 9th most common 12-bit still life, and it would rank third behind the ship-tie and mirrored table but ahead of the block on cap if it were strict.
Gallery
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See also
References
External links
- Bi-block at the Life Lexicon
- Bi-block at Adam P. Goucher's Catagolue (pseudo-object)