Because you don't notice the light without a bit of shadow. Everything has both dark and light. You have to play with it till you get it exactly right.
Libba BrayIt's only his thumb brushing slowly across the lower edge of my lip, but it's as if time slows and the sweep of that thumb below my mouth takes forever. It is no spell that I know of, but it holds such magic, I can scarcely breath. He pulls his hand away fast, aware of what he's done. But his touch lingers.
Libba Bray