expand_less Light (transverse waves) propagates using the wave pattern across sub-atomic protocols.  Sound (compression waves) propagates using the wave pattern across atomic protocos.  Wave partical duality as reading results of a process at different protocol levels.  Light pressure (photon as particle) is interpretation at the atomic level.  Interference patters is interpreting the results at sub-atomic levels.
Wheeled by Wagn v. 0.15.6