"It is either one or the other. It can't be both."
"Light is both a particle and a wave."
"I don't understand."
"There is a perfect symmetry, which is expressed as a balance of duality."
"What are you talking about now?"
"Have you ever heard of quantum mechanics?"
"No. Maybe. I don't know."
"It is the study of subatomic particles. The rules are different when you get that small."
"So, what is your point?"
"Light can act both as a wave and as particles because of the special nature of electrons."
"What does this have to do with symmetry?"