You find yourself in the midst of a strange land. You see Byzantine architecture bizarrely sutured together with massive Egyptian monuments. A howling expanse of endless desert paradoxically ends, transitioning immediately into a lush garden of stone walkways and fountains and blooming fruit trees. Above, the sky is bright blue and filled with fluffy clouds, but the sun itself is nowhere to be seen. There is no question that this is a dream. Nothing could be more sure in your mind. Yet it feels more real than anything you have experienced in your entire life. And you don't even remember falling asleep.