ingenious beyond belief. It was no mere Halloween assemblage of papier-maché flimflammery, but an elaborate and flexible mask of very thin plastic, or possibly metal. A prosthetic mask—if one could use that term in connection with a mask. It was certainly more complex in structure than any prosthetic leg or arm he had ever seen on a handicapped man, or would ever be likely to see.

He had a pretty good idea as to how it worked. A general idea. Apparently when the hooks were attached to the muscular structure of the human face underneath, every aspect of the wearer's face would be instantly controlled and altered to conform to the configuration of the false face. In that sense the mask could be said to actually mold itself to the wearer's face and transform it into a completely new and different face.

And yet, in some subtle way, the emotions felt by the owner of the real face would be conveyed to the mask, so that it would express with different features very much the same kinds of emotion.

Ingenious was scarcely the word for it. It was a miracle of technological science, almost beyond belief. But he could not doubt the reality of what he saw, for he held the evidence in his hand. No hallucination could possibly be that real.

The way the mask's surface coloration could change when the wearer's emotions changed was perhaps the most amazing miracle of all. He had seen the guard's color come and go, had watched him redden with anger and then grow pale.

It could only mean that there was some mechanically symbiotic, emotion-sensitive electronic coating or skin surface, or series of tubes on the inner surface of the mask, which could simulate actual blood flow much like a network of tiny heat regulators. This network would be so responsive to the slightest change in body temperature that the mask would alter its color the instant the wearer experienced fright or grew uncontrollably angry. What made it seem logical and even likely was the fact that caloric changes do occur in just such a fashion in the human body with every shift from anger to grief or from pain to shock.

There was nothing simple about the inner surface of the mask. It was a maze of complicated gadgetry concentrated in less than eight inches of space, perhaps thirty or forty separate mechanisms in all, some as tiny as the head of a pin, and others about one inch in width.

When the wearer became unconscious, the mask seemingly lost its integrity. The gadgets either stopped functioning or ceased 

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