Word: tetrahedra
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...extreme economic efficiency, and to applying these to "livingry" rather than "weaponry." Perhaps his greatest contribution in this respect has been his work with the tetrahedron, a four-faced pyramid which Fuller has discovered to be the most resistant of all polyhedra to external pressure. By combining many tetrahedra into a spherical shape (the sphere can withstand the greatest internal pressures), Fuller constructed his geodesic dome, an extremely light and economical structure of extraordinary strength...
...tetrahedron frequently appears in nature: the spatial orientation of a carbon atom's valence electrons, for example, is tetrahedral. Fuller also noted that all three-dimensional geometric figures reduce to combinations of tetrahedra. The tetrahedron, in fact, "is the minimum system for subdividing the universe...
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