Cloverleaf interchange
x = 13, y = 13, rule = B3/S23
4bo3bo4b$3bobobobo3b$3bobobobo3b$b2o2bobo2b2ob$o4bobo4bo$b4o3b4ob$13b$
b4o3b4ob$o4bobo4bo$b2o2bobo2b2ob$3bobobobo3b$3bobobobo3b$4bo3bo4b!
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#C Still life
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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 .
While known for many years beforehand due to its ability to be hassled, it is notable due to a natural occurrence being found in the ash of a random asymmetric soup by Adam P. Goucher on August 12, 2016 .[1] [2] This made it the single 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. It has since been tied in C1 by another, unnamed 56-cell still life found by John Goodman in September 2021 .[3]
BlinkerSpawn found a 12-glider synthesis on the same day.[4] GUYTU6J improved this to 10 gliders on February 5, 2020 .[5]
A cloverleaf interchange can be hassled by Carnival shuttles , like this:
x = 49, y = 49, rule = B3/S23
10b2obo21bob2o$14bo3bo11bo3bo$10bo7b2o9b2o7bo$11b2ob2o2bo11bo2b2ob2o$
15bo2b2ob2o3b2ob2o2bo$14b2o7bobo7b2o$15bo3bo9bo3bo$20bob2ob2obo3$obo
43bobo$o2bo17b3ob3o17bo2bo$3bo41bo$o21bo3bo21bo$bobobo16bo3bo16bobobo$
3b4o14b3ob3o14b4o3$b4o17bo3bo17b4o$2bobobo14bobobobo14bobobo$7bo13bobo
bobo13bo$4bo6bo3bo3b2o2bobo2b2o3bo3bo6bo$4bo2bo3bob3o2bo4bobo4bo2b3obo
3bo2bo$5bobo3bo3bo3b4o3b4o3bo3bo3bobo2$5bobo3bo3bo3b4o3b4o3bo3bo3bobo$
4bo2bo3bob3o2bo4bobo4bo2b3obo3bo2bo$4bo6bo3bo3b2o2bobo2b2o3bo3bo6bo$7b
o13bobobobo13bo$2bobobo14bobobobo14bobobo$b4o17bo3bo17b4o3$3b4o14b3ob
3o14b4o$bobobo16bo3bo16bobobo$o21bo3bo21bo$3bo41bo$o2bo17b3ob3o17bo2bo
$obo43bobo3$20bob2ob2obo$15bo3bo9bo3bo$14b2o7bobo7b2o$15bo2b2ob2o3b2ob
2o2bo$11b2ob2o2bo11bo2b2ob2o$10bo7b2o9b2o7bo$14bo3bo11bo3bo$10b2obo21b
ob2o!
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References
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