Following on from the ring of 14 Snub Disphenoids, here’s a ring of 15 Hebesphenomegacorona:

A Hebesphenomegacorona is one of the Johnson Solids – J89 – and is made up of 18 triangular and 3 square faces. It’s an odd shape, with the 3 squares forming a “base” surrounded by pyramids of triangles.

I learnt about this shape from a GeoMag version posted by Livio Zucca. There are no additional joining shapes in this piece, it’s just 15 identical polyhedra joined on a pair of faces. It’s slightly crowded, as it isn’t a perfect circle, but that also means it’s a very stable shape.

Like the previous ring this one also uses 12mm bugle beads and nylon monofilament and is weaved with polyhedral angle weave. It’s slightly larger than the ring of snub disphenoids, but it’s also just the right size to be worn as a very chunky bangle!