I found a list of seven a long time ago but lost the reference, they are:   1. Polygon (includes the Circle) 2. Sphere (least surface for given volume) 3. Spiral (6% more growth along one side) 4. Helix (3D Spiral) 5. Vortex (Double Helix) 6. Meander (River Flow, etc) 7. Branches (4 types: Explosion, … Read more