It's often said that light has both "wave-like" and "particle-like" properties, that light is both "wave-like" and "particle-like." But such a concept is fundamentally out of sync with reality. For, while it's true that light exhibits "particle-like" properties, the same cannot be said about "wave-like" properties. Real waves aren't "wave-like" any more than a real duck is a manifestation of being "duck-like." "Particle-like?" Yes, because photons have no rest mass. "Wave-like?" Uh, no, it's a real wave. Conceptually, the more correct thing to say is that light has both particle-like and wave properties. Symmetry shouldn't be artificially inserted.