Abstract
Rather than regarding the occurring, massless, wave-like photon as an existing, massy particle, the two can be seen as opposites. This opposition carries over into how the two utilize dimensions: particle rest mass requires space to exist and always advances in time; photon kinetic energy cycles require time to occur and always advance in space. The photon and the inertial particle exchange the equalities that special relativity identifies: particle mass for photon energy and particle time advance for photon space advance. They are inversely symmetrical. This symmetry provides a different approach to some traditional paradoxes in radiation and new insights into the double slit experiment, the wave function and even the measurement problem.