Bookend
| Bookend | |||||||
| View static image | |||||||
| Pattern type | Induction coil | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 7 | ||||||
| Bounding box | 4 × 3 | ||||||
| Static symmetry | C1 | ||||||
| Discovered by | Unknown | ||||||
| Year of discovery | 1970 | ||||||
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Bookend is generation 1 of century and an induction coil.
Many patterns that can be stabilized using bookends can also be stabilized using the smaller snake, but sufficiently long lines (for instance a line of 7) require using either this, the house or the largely equivalent bun. An example appears in the champagne glass oscillator.
It can also be seen as a cis version of the eater 1. However, the pre-block terminal cannot function as eater 1.
While the bookend is also sometimes referred to as hook, this name is discouraged as to prevent confusion with the other still life component called hook.
Bookend-bookend still lifes
As mentioned previously, it can act as an induction coil. Two bookends suffice to make a still life, with five possible isomers:
There is a sixth still life with a physical connection between both bookends:
As a catalyst
The bookend can function as a catalyst when stabilized. Most commonly, a set of cis-mirrored bookends is used, which works when the pattern is symmetric; examples can be seen on that page. A single stabilized bookend can catalyze asymmetric patterns in various ways, such as in David Hilbert, CP semi-cenark and HLx111R. In addition, BTS is a useful catalyst that has a bookend (B) stabilized with a table (T) and a snake (S).
In other rules
In rule B34c/S23, the bookend grows to infinity. The back end stabilizes at tick 1542.
In rule B3/S234iw, the bookend evolves into a c/42d spaceship.
See also
External links
- Bookend at the Life Lexicon