Mirrored dock

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Mirrored dock
x = 7, y = 6, rule = B3/S23 2o3b2o$obobobo$2bobo$2bobo$obobobo$2o3b2o! #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 20
Bounding box 7 × 6
Frequency class 19.2
Discovered by Unknown
Year of discovery Unknown

Mirrored dock is a 20-cell strict still life consisting of two mutually stabilising docks. It is one of two ways in which two docks can be arranged to create a still life.

Skewing the two constituent houses gives rotated dock.

It can eat single gliders from four directions.


See also: List of common still lifes

Mirrored dock is the fifty-third most common still life in Achim Flammenkamp's census, being less common than cis-shillelagh but more common than broken snake.[1]

It is the 48th most common still life on Adam P. Goucher's Catagolue, being less common than elevener but more common than block on cap. It is the most common still life with 20 cells, being 197 times as common as xs20_6a88b96z2553.[2]

x = 36, y = 14, rule = B3/S23 2b3o$b5o22bobobobo$o5bo21bo5bo$b5o22bobobobo$2b3o$31bo$3bo27bo$31bo2$ 27b3o3b3o2$31bo$31bo$31bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 6 ]]
Two different pulsar predecessors hitting a spark (left) or traffic light (right) and creating mirrored docks
(click above to open LifeViewer)
RLE: here Plaintext: here

Glider synthesis

All strict still lifes with a population of 21 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.

See also


  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