" Did you ever happen to think, Dr. Haber,' he said, quietly enough but stuttering a little, 'that there, there might be other people who dream the way I do? That reality's being changed out from under us, replaced, renewed, all the time—only we don't know it? Only the dreamer knows it, and those who know his dream. If that's true, I guess we're lucky not knowing it. "

― Ursula K. Le Guin , The Lathe of Heaven