ing, 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.

* * * * *

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 posit