Cloverleaf interchange

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Cloverleaf interchange
x = 13, y = 13, rule = B3/S23 4bo3bo4b$3bobobobo3b$3bobobobo3b$b2o2bobo2b2ob$o4bobo4bo$b4o3b4ob$13b$ b4o3b4ob$o4bobo4bo$b2o2bobo2b2ob$3bobobobo3b$3bobobobo3b$4bo3bo4b! #C [[ THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 480 ]]
Pattern type Strict still life
Number of cells 56
Bounding box 13×13
Discovered by Adam P. Goucher
Year of discovery 2016
For other uses of "cloverleaf", see Cloverleaf (disambiguation).

Cloverleaf interchange (or fourfold racetrack-weld-racetrack) is a 56-cell still life exhibiting D8_1 symmetry.

A natural occurrence was found in the ash of a random soup by Adam P. Goucher on August 12, 2016.[1] This makes it the largest known still life to occur completely naturally, surpassing the previous record holder, the 46-cell professor; it had previously arisen semi-naturally in various higher symmetries, including C2_1, C4_1, D2_+1, D4_+1, D4_+2 and D4_x1.

'BlinkerSpawn' found a 12-glider synthesis on the same day.[2]


  1. Adam P. Goucher (August 12, 2016). "Haul". Catagolue. Retrieved on August 12, 2016.
  2. BlinkerSpawn (August 12, 2016). "Re: Soup search results". forums. Retrieved on August 12, 2016.

External links