Continuing what I started in December, I finally finished making a stellated icosahedron out of 30 Sonobe units. Each Sonobe unit corresponds to an edge of the icosahedron, and interlocks with three others to give the whole thing a remarkable degree of rigidity, even though it’s made completely out of paper.
Here are the requisite photos, showing first fivefold symmetry:
Unlike with the cube and octahedron I made out of Sonobe units, where I just put colors together more or less randomly (only ensuring that no two touching units were the same color), with this icosahedron I very carefully researched a color scheme with some really nice mathematical properties. I’ll explain that in my next post!