Tetrahedron as Vectorial Model of Quantum: The tetrahedron as a basic vectorial model is the fundamental structural system of the Universe. The open-ended triangular spiral as action, reaction, and resultant (proton, electron, and antineutrino; of neutron, positron, and neutrino) each becomes a half quantum. An association of positive and negative half-quantum units (3 vectors each or six vectors total) identifies the tetrahedron as one quantum of system structuring energy.