Even the honey bees understand the importance of the hexagon.
The most efficient and robust use of space to build a hive with.
A hexagonal structure uses the least material to create a lattice of cells within a given volume.
The closed ends of the honeycomb cells are also an example of geometric efficiency, albeit three-dimensional and little-noticed. The ends are trihedral (i.e., composed of three planes) sections of rhombic dodecahedra, with the dihedral angles of all adjacent surfaces measuring 120°, the angle that minimizes surface area for a given volume.