This structure grows a highly complex pattern of polygonal faces with different numbers of sides. The growth rules are simple and deterministic and so one intuitively picks up on a kind of cohesion behind the form. It is also very interesting to see how the surface bulges and warps as a result of the different polygons included. Youtube video: https://www.youtube.com/watch?v=wxwvMNF_m2k&list=PLCTMeyjMKRkrhMSOf0SD677liIG6aaZ_3My website https://sites.google.com/site/richardsouthwell254/home has loads of free 3D printing resources (design apps & stls) on it.