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Kelvin Foam
Another tessellation of space by zonohedra (truncated octahedra). Kelvin conjectured incorrectly that this tesselation, more formally known as the bitruncated cubic honeycomb, is the most efficient way to partition space into unit-volume cells (as measured by the surface area of the cells). However, a different tessellation, the Weaire–Phelan structure, has even smaller surface area.