More than 4,000 years ago, Gudea, the ruler of the Sumerian city of Girsu, had a dream. Before him, flanked by lions, appeared a man as large as the heavens and the earth, with the head of a god, the wings of a thunderbird, and a lower body in the form of a flood wave. The man uttered something about building a house. A woman consulted a tablet depicting heavenly stars. On a lapis lazuli plate, a warrior outlined the plans of a building. Birds in a poplar tree twittered away, and a stallion pawed at the ground. Unsure what to make of his vision, Gudea traveled by canal to the temple of Nanshe, a goddess known to interpret dreams for other gods. She explained it to him thus: The…