Two of them scurried past his window, clearly illuminated by lights far up in the domed ceiling. They were furry, about five feet tall, lithe and cat-like in their movements. Compared to a human, they were slim and short-bodied. They possessed three arms and three legs, each set being equally spaced about their bodies. Now and then, as they walked with short, rapid steps, frequent joints were apparent in all limbs, showing clearly that they were not just muscular tentacles. From the openings at the apexes of their heads, which must have been mouths, they were streamlined in a fashion that made it more natural to picture them swimming like Terran cuttlefish then climbing up and down thick poles. The three eyes set about each head were low enough to allow for jaw muscles. The man watched this pair slide down a column set beside the wall that concealed him. Other individuals were scattered about the wide concourse. Almost without exception, they wore nothing more than a pouch secured by a belt just above what would have been the hips in a human. Clothing was made unnecessary by handsome coats of short, honey-colored fur that enhanced their feline air. Sometimes, when one or another bent or twisted, purple skin would show through the fur. Across the concourse, the man could see open stalls that suggested shops. Most of them were dark inside, with nettings stretched across the fronts. The general atmosphere was not unlike that of a small Terran business section, or even a spaceport terminal, late in the evening with business slack and only night workers about. Abruptly, those abroad scuttled for the walls. A perfectly good reason for the exodus appeared a moment later, as a column of low, long vehicles dashed from a high-arched tunnel and shot across the open space. Each was three-wheeled and carried half a dozen individuals wearing what resembled thick plastic armor. Cages of metal guarded their heads and they bore weapons like Terran rocket launchers. The convoy passed out of sight before the man could note more. He retreated thoughtfully from the window. At the opening to the corridor, he paused indecisively. He shook his head as if trying to put out of his mind what he had just witnessed. It might have been prudent for anyone in his position to give the corridor a searching look before entering, but this did not seem to occur to him. In seconds, he was striding along in the former direction--if anything, a trifle more briskly. As he walked, the muffled sounds from the scene he had examined faded in the distance. Once again, he was alone with his own discreet footfalls. Several times, he passed junctions of cross corridors, and once he had to burn open a door; but never did he meet an inhabitant of the hive-like city. Either the way had been shrewdly chosen or it was seldom used at this period of the day. Even granting both, his luck must have been fantastic.