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x = 6, y = 5, rule = B3/S23 b2ob2o$2bobo$bo2bo$bobo$2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 48 ]]
Pattern type Strict still life
Number of cells 14
Bounding box 6 × 5
Frequency class 23.6
Discovered by Unknown
Year of discovery Unknown

Sidewalk (or pavement) is a 14-cell still life made up of two islands that are by themselves referred to as sides. An individual side can occasionally be useful as an induction coil.

Peter Raynham found a 4-glider synthesis for the still life in 1973, which is based on a head-to-head collision between two pi-heptominoes.[1]

x = 7, y = 4, rule = B3/S23 5b2o$2o2b2o$b2o2b2o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 4 HEIGHT 480 ZOOM 64 GPS 1 T 0 PAUSE 2 T 2 PAUSE 4 LOOP 3 ]]
A sidewalk predecessor
(click above to open LifeViewer)
RLE: here Plaintext: here


See also: List of common still lifes, Large natural still lifes

Sidewalk is the 150th most common still life on Adam P. Goucher's Catagolue, being less common than O quad-loaf but more common than xs14_2egu156. Among all still lifes with 14 cells, it is the 22nd most common, being less common than beehive with hooked nine but more common than xs14_2egu156.[2]

It is the thirty-sixth most common object on Catagolue in the symmetry the object has (C2_2).

See also


  1. Robert Wainwright (June 1973). Lifeline, vol 10, page 2.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 29, 2023.

External links