Look at the sun; only that you cant. Blinded by its energy, heat and light, offered to you by intergalactic tranportation. It rises, and falls. But you always know that its there, its absence reflected in the midnight sun, the moon. Warmth is not the absence of coldness. It migrates easily, even between humans, when they want to be like the sun - giving energy. Light, though, is nothing but the absence of darkness. You recognize darkness, we all do. Which is good.