Bookend bridge bookend

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 ]]
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Pattern type	Strict still life
Number of cells	14
Bounding box	6 × 6
Frequency class	28.9
Static symmetry	Unspecified
Discovered by	Unknown
Year of discovery	Unknown
Rules Outer-totalistic rules B/S23 – B3678/S012345678 # of rules 211 = 2048 Isotropic rules B/S2ae3nry – B2-ak34-jn5-jq678/S012345678
Glider synthesis Fewest gliders 5 Catagolue-generated RLE synthesis
Pattern files Plaintext bookendbridgebookend.cells RLE bookendbridgebookend.rle
Identifiers apgcode xs14_64lb8ozw11 Pentadecathlon ID 14.561

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.

x = 18, y = 6, rule = B3/S23 b4o$o3bo$4bo9bo2bo$o2bo9bo$13bo3bo$13b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 THEME Book ZOOM 18 AUTOSTART GPS 12 T 0 PAUSE 1 T 19 LOOP 20 ]] The collision described above (click above to open LifeViewer)

Commonness

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

• 14.561 at Heinrich Koenig's Game of Life Object Catalogs

• Bookend bridge bookend at Adam P. Goucher's Catagolue