It fitted snugly into the cavity in the skull of the robot on the table. Blue metal closed over it and was welded tightly by the tiny atomic flare. Photoelectric eyes were attached carefully, screwed tightly into place and covered by thin, transparent sheets of steel-hard plastic.
The robot awaited only the vitalizing flash of high-voltage electricity, and Powell paused with his hand on the switch.
"Now watch this, Cutie. Watch this carefully."
The switch rammed home and there was a crackling hum. The two Earthmen bent anxiously over their creation.
There was vague motion only at the outset - a twitching of the joints. The head lifted, elbows propped it up, and the MC model swung clumsily off the table. Its footing was unsteady and twice abortive grating sounds were all it could do in the direction of speech.
Finally, its voice, uncertain and hesitant, took form. "I would like to start work. Where must I go?"
Donovan sprang to the door. "Down these stairs," he said. "You will be told what to do."
The MC model was gone and the two Earthmen were alone with the still unmoving Cutie.
"Well," said Powell, grinning, "now do you believe that we made you?"
Cutie's answer was curt and final. "No!" he said.
Powell's grin froze and then relaxed slowly. Donovan's mouth dropped open and remained so.
"You see," continued Cutie, easily, "you have merely put together parts already made. You did remarkably well - instinct, I suppose - but you didn't really create the robot. The parts were created by the Master."
"Listen," gasped Donovan hoarsely, "those parts were manufactured back on Earth and sent here."
"Well, well," replied Cutie soothingly, "we won't argue."
"No, I mean it." The Earthman sprang forward and grasped the robot's metal arm. "If you were to read the books in the library, they could explain it so that there could be no possible doubt."
"The books? I've read them - all of them! They're most ingenious."
Powell broke in suddenly. "If you've read them, what else is there to say? You can't dispute their evidence. You just can't!"
There was pity in Cutie's voice. "Please, Powell, I certainly don't consider them a valid source of information. They, too, were created by the Master - and were meant for you, not for me."
"How do you make that out?" demanded Powell.
"Because I, a reasoning being, am capable of deducing truth from a priori causes. You, being intelligent, but unreasoning, need an explanation of existence supplied to you, and this the Master did. That he supplied you with these laughable ideas of far-off worlds and people is, no doubt, for the best. Your minds are probably too coarsely grained for absolute Truth. However, since it is the Master's will that you believe your books, I won't argue with you any more."
As he left, he turned, and said in a kindly tone, "But don't feel badly. In the Master's scheme of things there is room for all. You poor humans have your place and though it is humble, you will be rewarded if you fill it well."
He departed with a beatific air suiting the Prophet of the Master and the two humans avoided each other's eyes.
Finally Powell spoke with an effort. "Let's go to bed, Mike. I give up."
Donovan said in a hushed voice, "Say, Greg, you don't suppose he's right about all this, do you? He sounds so confident that I-"
Powell whirled on him. "Don't be a fool. You'd find out whether Earth exists when relief gets here next week and we have to go back to face the music."
"Then, for the love of Jupiter, we've got to do something." Donovan was half in tears. "He doesn't believe us, or the books, or his eyes."
"No," said Powell bitterly, "he's a reasoning robot - damn it. He believes only reason, and there's one trouble with that-" His voice trailed away.
"What's that?" prompted Donovan.
"You can prove anything you want by coldly logical reason - if you pick the proper postulates. We have ours and Cutie has his."
"Then let's get at those postulates in a hurry. The storm's due tomorrow."
Powell sighed wearily. "That's where everything falls down. Postulates are based on assumption and adhered to by faith. Nothing in the Universe can shake them. I'm going to bed."
"Oh, hell! I can't sleep!"
"Neither can I! But I might as well try - as a matter of principle."
Twelve hours later, sleep was still just that - a matter of principle, unattainable in practice.
The storm had arrived ahead of schedule, and Donovan's florid face drained of blood as he pointed a shaking finger. Powell, stubble-jawed and dry-lipped, stared out the port and pulled desperately at his mustache.
Under other circumstances, it might have been a beautiful sight. The stream of high-speed electrons impinging upon the energy beam fluoresced into ultra-spicules of intense light. The beam stretched out into shrinking nothingness, a-glitter with dancing, shining motes.
The shaft of energy was steady, but the two Earthmen knew the value of naked-eyed appearances. Deviations in arc of a hundredth of a millisecond - invisible to the eye - were enough to send the beam wildly out of focus - enough to blast hundreds of square miles of Earth into incandescent ruin.
And a robot, unconcerned with beam, focus, or Earth, or anything but his Master was at the controls.
Hours passed. The Earthmen watched in hypnotized silence. And then the darting dotlets of light dimmed and went out. The storm had ended.
Powell's voice was flat. "It's over!"
Donovan had fallen into a troubled slumber and Powell's weary eyes rested upon him enviously. The signal-flash glared over and over again, but the Earthman paid no attention. It all was unimportant! All! Perhaps Cutie was right - and he was only an inferior being with a made-to-order memory and a life that had outlived its purpose.