Harper knew he was gazing upon a being of the fourth dimension--doubtless the Entity that had caused the phenomena in the laboratory, which had snatched him into the fourth dimension, and was even now observing him with its four dimensional sight! There was a shape above him that strained his eyes, gave hint of Form just beyond his comprehension. Harper hardly noticed that Pillbot was beside him, shaking him. He had suddenly grasped a fundamental law of spacial stresses, and he whipped out a pad and pencil, began scribbling down the mathematical formula of these laws. He began to see now why skyscrapers encountered the "stress-barrier" at a certain height. He understood it just as a person of innate musical ability, hearing music for the first time, would understand the laws of that music. "Look out, It's moving, descending!" Pillbot was yelling into his ear. "It is about to act. Became active the moment you got here. How did you induce it to bring you here?" "Huh?" Harper looked up from his scribbling. "Oh." Harper explained quickly how he had induced the Being to act on himself. "That's it!" cried Pillbot hoarsely. "You switched the pattern of imitation on It--tricked It into bringing you here. That's what made it angry--" "Angry?" Harper almost dropped his pad, clutched at Pillbot as there was a sudden upheaval of the invisible tension-surface on which they stood. A violent shake sprawled them on the "ground" and now Harper saw the torso of Gault, a few feet away, apparently hovering above the surface. "Yes, angry!" Pillbot was pale. "As long as you merely gave it something to imitate it was pacified. But now it recognizes opposition, an effort to outwit it due to your switching the pattern of imitation. Its condition is dangerous--it's bound to react violently. We have to get out of here. You must know some way--" Harper again scribbled some figures on his pad. "As soon as I've worked out this formula--" Pillbot shook him frantically. "Can't you understand! This Creature is a mental patient of a violent type. We are in a _fourth dimensional insane asylum_!" Pillbot gazed upward fearfully at a descending mass. "The pattern of its action fits perfectly," he went on. "Some violent type of insanity, combined with delusions of grandeur. Any slightest opposition will cause a spasm of fury. It recognizes such opposition in the way you tricked it into bringing you here. At first I thought it was a primitive mentality, but now I know it is a highly evolved, but insane creature, thinks it's Napoleon, wants to conquer the three dimensional plane which its attention has been attracted to in some way--" Harper looked up in surprise. "Does it know about Napoleon?" "Of course not, you fool!" screamed Pillbot. "It has the Napoleonic complex, identifies itself with some great conqueror of its own realm. And now it's on the rampage. We have to get out of here--" He clutched at Harper as another upheaval of the surface threw them down.