All experimental data is consistent with massless neutrinos. There exist possibilities other than rest mass differences to explain oscillation. Two essential concepts - geometric representation of Clifford algebra vacuum wavefunctions and impedance matching of wavefunction interactions - were lost in quantum physics. Their synthesis empowers calculating quantized impedance networks of wavefunction interactions. Both concepts are important. Unlike Pauli and Dirac matrices, geometric representation permits wavefunction visualization during interactions, though not without topological complexity. And impedance matching governs amplitude and phase of energy flow, of information transmission. We present three-component neutrino and muon wavefunctions in geometric representation, and impedance networks of S-matrix modes generated by wavefunction interactions as modeled by spatial dimension-changing Clifford products. This permits massless neutrino oscillation via self-excited vacuum impedance phase shifts, both geometric and topological. It suggests we get real, step beyond model and theory with a simple proof-of-principle experiment in the Fermilab muon g-2 Delivery Ring. It offers the possibility of demonstrating both massless oscillation and low energy muon lifetime enhancement, complementary to Muon Collider relativistic time dilation at high energy.