Read this excerpt from "The World on Turtle's Back." The right-handed twin lives in the Sky-World and he is content with the world he helped to create. The left-handed twin lives in the world below. He, too, is content with the world of men. He delights in the sounds of warfare and suffering. These two beings rule the world and look after the affairs of men. During the day people have rituals to honor the right-handed twin. At night they dance and sing for the left-handed twin. According to this excerpt, the two brothers represent