When R. Buckminster Fuller attempted to find the smallest solids that could fill space he made an interesting discovery. He rejected cubes as unstable and found that not one solid, but two were required: the tetrahedron and the octahedron. The product of his work was the octet truss which he patented.
When we look at classical and quantum physics we deal with not one but two versions of reality. The unobserved reality and the observed reality. Unobserved reality is a tetrahedron composed of four unities:
Observed reality is an octahedron composed of six unities:
Each unity is composed of three dimensions. Therefore, the unobserved universe is twelve dimensional and the observed universe is eighteen dimensional. At least, that is my hypothesis. The unobserved and observed universe join like the equilateral faces of a tetrahedron and an octahedron to create the universe as it behaves in an infinite matrix of octet space.