All structuring can be topologically identified in terms of tetrahedra
In every triangle each comer angle tension connector serves as the common interfulcrum of the two push-pull, rigid lever arms comprising two of the three sides of the triangle adjacent to their respectively common angular corners (…); thus we find the triangle to be not only the unique pattern-self-stabilizing, multienergied complex, but also accomplishing pattern stabilization at minimum effort, which behavior coincides with science’s discovery of the omni-minimum-effort behavior of all physical Universe.
If we want to have a structure, we have to have triangles. To have a structural system requires a minimum of four triangles. The tetrahedron is the simplest structure.
[R. Buckminster Fuller, Synergetics]