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.

Rising, Harper put away his pad. His calculations were complete. He could now show engineers how to build high buildings, taking advantage of space stress instead of trying to fight the stress.

For the first time, the danger of their position seemed to penetrate to his consciousness. He looked about—and his eyes rested on a strange familiar projection rising from the invisible floor a few feet away. It was the section of his clay statue that had vanished—vanished because its peculiar shape had somehow caused it to be warped into the fourth dimension!

Why hadn't he been able to move it—Professor Gault moved about freely.

He and Pillbot went over to it, tried to move it. A slight filmy webwork around the projection caught Harper's eye. Now he knew—the Being had somehow affixed it to the spot as a landmark, so It could locate the laboratory. It must have been this projection that had first attracted the Being's attention to the three dimensional world, since, ordinarily, It would never have noticed the presence of three dimensional life, any more than humans would notice the presence of two dimensional life if such existed!

Harper looked up at a bleat from Pillbot. Above them was a sudden furious play of lights and shades. Vast masses seemed shifting in crazy juxtapositions, now descending rapidly toward them.

"Quick," Harper, now fully aroused, gasped to Pillbot. "Climb down this projection!"

"Climb down it—?"

"Yes, there is a fluid condition of space where it penetrates between the two planes. By hugging its contours you will emerge into the laboratory—I hope!"

Pillbot glanced overhead nervously, then experimentally slid a font down the projection. The foot vanished. With a cry of relief, Pillbot lowered himself until only head and shoulders were visible. Then that too vanished.

Harper looked up. Some monstrous suggestion of Form was almost upon him. He grasped the projection and just as his head sank out of sight the Form seemed to smash down on him.

Pillbot helped Harper to his feet, from where he had sprawled at the base of the statue, on the laboratory floor.

"Quick," he gasped. "The Creature will be infuriated now, by our escape from Its realm. A