Peter stared his disbelief. Automated plants were nothing new, but they all had their limitations. Either they dealt with exactly similar products or things that could be handled on a flow basis, like oil or water-soluble chemicals. Even these had no more to do than process the goods. "Come on," said Lexington, getting massively to his feet. "I'll show you." * * * * * The office door opened, and Peter found himself being led down the antiseptic corridor to another door which had opened, giving access to the manufacturing area. As they moved along, between rows of seemingly disorganized machinery, Peter noticed that the factory lights high overhead followed their progress, turning themselves on in advance of their coming, and going out after they had passed, keeping a pool of illumination only in the immediate area they occupied. Soon they reached a large door which Peter recognized as the inside of the truck loading door he had seen from outside. Lexington paused here. "This is the bay used by the trucks arriving with raw materials," he said. "They back up to this door, and a set of automatic jacks outside lines up the trailer body with the door exactly. Then the door opens and the truck is unloaded by these materials handling machines." Peter didn't see him touch anything, but as he spoke, three glistening machines, apparently self-powered, rolled noiselessly up to the door in formation and stopped there, apparently waiting to be inspected. They gave Peter the creeps. Simple square boxes, set on casters, with two arms each mounted on the sides might have looked similar. The arms, fashioned much like human arms, hung at the sides, not limply, but in a relaxed position that somehow indicated readiness. Lexington went over to one of them and patted it lovingly. "Really, these machines are only an extension of one large machine. The whole plant, as a matter of fact, is controlled from one point and is really a single unit. These materials handlers, or manipulators, were about the toughest things in the place to design. But they're tremendously useful. You'll see a lot of them around." Lexington was about to leave the side of the machine when abruptly one of the arms rose to the handkerchief in his breast pocket and daintily tugged it into a more attractive position. It took only a split second, and before Lexington could react, all three machines were moving away to attend to mysterious duties of their own. Peter tore his eyes away from them in time to see the look of frustrated embarrassment that crossed Lexington's face, only to be replaced by one of anger. He said nothing, however, and led Peter to a large bay where racks of steel plate, bar forms, nuts, bolts, and other materials were stored.