Bookend bridge bookend

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Bookend bridge bookend
x = 6, y = 6, rule = B3/S23 3b2o$3bo$2obobo$obob2o$2bo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ ZOOM 42 ]]
Pattern type Strict still life
Number of cells 14
Bounding box 6 × 6
Frequency class 28.9
Static symmetry .k (C2_4)
Discovered by Unknown
Year of discovery Unknown

Bookend bridge bookend is a 14-cell strict still life consisting of two mutually stabilising bookends. It is one of six ways in which two bookends can be arranged to create a still life, and the only one which only has a single island.

It can occur from a rotationally-symmetric collision of two lightweight spaceships, shown below.

x = 14, y = 6, rule = B3/S23 b4o$o3bo$4bo5bo2bo$o2bo5bo$9bo3bo$9b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 360 WIDTH 600 THUMBSIZE 2 ZOOM 28 GPS 2 AUTOSTART T 0 PAUSE 2 T 9 PAUSE 1 LOOP 10 ]]
The collision described above
(click above to open LifeViewer)

Occurrence

See also: List of common still lifes

Bookend bridge bookend is currently the 603rd most common object on Adam P. Goucher's Catagolue, being less common than the unnamed still life xs19_69mgmiczw66, but more common than the unnamed still life xs15_j5q8a6z11.

Glider synthesis

All strict still lifes with a population of 22 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 31 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

External links