Cloverleaf interchange (or four-fold 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]; 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-glidersynthesis on the same day,[2].
References
↑Adam P. Goucher (August 12, 2016). "Haul". Catagolue. Retrieved on August 12, 2016.
↑BlinkerSpawn (August 12, 2016). "Re: Soup search results". ConwayLife.com forums. Retrieved on August 12, 2016.