The Porcyn clothing he was wearing consisted of low leather boots, long green hose, leather shorts, a bright purple blouse and a sky-blue cape. Dan bunched the cape in his hand and thrust it ahead of him as he crossed the rail, for some races were finicky about their exits and entrances. The straight, sharp boundary between city and farmland, and the identical buildings, suggested to Dan that here was a race controlled by strict rules and forms, and he was making an obviously unauthorized entrance. It was with relief that he stood on the opposite side, within the city. He glanced back at the sign and wondered what "Swept" meant. Then he gave his attention to the buildings ahead of him. * * * * * Low at first, the buildings rose regularly to a greater height, as far as the fog would let him see. Dan remembered the storm of the night before and wondered if the progressive heightening of the buildings was designed to break the force of the wind. The buildings themselves were massive, with few and narrow windows, and wide heavy doors opening on the street. Dan walked farther into the city and found that the street took right-angle bends at regular intervals, probably also to break the wind. There was no one in sight, and no vehicles. Dan decided he was probably in a warehouse district. He paused to look at a partly erected new building, built on the pattern of the rest. Then he heard from up the street a grunting, straining sound interspersed with whistling puffs. There was a stamping noise, a _thud_ and the clash of metal. Dan ran as quietly as he could up the street, stopped, glanced around one of the right-angle bends. He was sure the sound had come from there. The street was empty. Dan walked closer and studied a large brass plate set in the base of a building. It looked about twenty inches high by thirty wide with a rough finish. In the center of the plate was a single word: SWEEPER Dan looked at this for a moment. Then, frowning, he strode on. In his mind's eye, he was seeing the sign by the road: Care High-Speed Vehicles Only --_Swept_-- Dan couldn't decide whether the word "Swept" was part of the warning or just an afterthought. In any case, he had plainly heard a struggle here and now there was nothing to be seen. Alert for more brass plates, he wound his way through the streets until he came out on a broad avenue. On the opposite side were a number of tall, many-windowed buildings like apartment houses. On the sidewalks and small lawns in front, crowds of children were playing. They were wearing low boots, leather shorts or skirts, brightly colored blouses and hose, and yellow capes. Walking quietly among them was a tawny animal with the look and lordly manner of a lion. It _was_ a lion.