Sam closed his eyes, trying to shut out the street sounds and concentrate. The noise wouldn’t go away, but the passage of vehicles in the roadway began to take on a rhythm. The harder he tried, the heavier his head felt. It sank down slowly only to jerk up again, jolting him from his effort. He tried again. This time, when the jerk came, he realized that he was standing. Now both his head and his whole body felt light, open, and clear, nearly floating. He opened his eyes and looked himself over. Everything seemed normal, except that all his equipment and belongings, save for his good-luck fossil tooth, looked slightly insubstantial. The tooth was as real and solid as his flesh.