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"Specifically, these molecules introduce in-plane hydrogen bonding that is compatible with both the ionic nature and octahedron spacing of halide perovskites," she said.

All of this is enough to send any mother into a spiral of madness, or an even more elaborate shape — a Möbius strip of insanity, an octahedron of derangement.

Adjacent octahedrons were rotated 90 degrees from one another and connected at the corners.

The Feb. 22 Local Living article “Give your bookshelf a little more character” included a geometric object labeled “large octahedron.”

The second is a specific bonding geometry, which is achieved when octahedra formed from metal and oxygen ions share their edges to form a honeycomb lattice.