Cis-bookend and bun

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Cis-bookend and bun
x = 7, y = 4, rule = B3/S23 2o3bo$obobobo$2bobobo$b2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 57 ]]
Pattern type Strict still life
Number of cells 14
Bounding box 7 × 4
Frequency class 20.5
Discovered by Unknown
Year of discovery Unknown

Cis-bookend and bun is a 14-cell strict still life consisting of a bookend and a bun stabilising each other. It is one of seven ways in which a bookend and a bun can be arranged to create a still life, and one of the six which have two separate islands (see bookend and bun family below).

This specific isomer is named cis due to the two inducting faces not being skewed from each other, and the "denser" parts of each island are roughly on the same side.


Main article: List of common still lifes

Cis-bookend and bun is the sixty-fifth most common still life in Achim Flammenkamp's census, being less common than boat with long tail but more common than beehive at loaf.[1]

It is the 68th most common still life on Adam P. Goucher's Catagolue, being less common than tub with long tail but more common than hook with tail. It is the 11th most common still life with 14 cells, being less common than trans-bookend and bun but more common than trans-rotated bun.[2]

Glider synthesis

All strict still lifes with a population of 21 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

Bookend and bun family


  1. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 5, 2023.

External links