Produced by Greg Weeks, Stephen Blundell and the Online Distributed Proofreading Team at https://www.pgdp.net [Illustration: The doctor did a very strange thing; he pulled out a gun and shot himself through the head.] UNTHINKABLE By ROG PHILLIPS If Nature suddenly began to behave differently, what we consider obvious and elementary today might become--unthinkable. In the story THE DESPOILERS in the October 1947 _Amazing Stories_ I raised the question, "Is there anything absolutely beyond human comprehension?" In that story I gave humanity a thousand years to give birth to one man who could comprehend the incomprehensible. The incomprehensible is harder to portray in a story than is merely the unknown. If we denote anything incomprehensible by the symbol X, we can describe what X is to a certain extent by knowing what it is not. We can, gradually, gain a certain insight into what it is by comparing it to what IS comprehensible. In the last analysis the universe of normalcy is incomprehensible. We have made progress in comprehending it because we have isolated it into small bundles of events that can be dealt with by the human intellect. We have arrived at certain basic pictures of the behavior of the incomprehensible. We have found a certain stability existing in the picture we have built up. We have searched the heavens and found that stars are made up of the same elements as the Earth--with a few exceptions. And with those exceptions we have brought them into the framework of our picture of the Universe by postulating "dense matter." We have, slowly, come to the belief that the same laws operate throughout the entire Universe, just as they do here on the Earth. This is the Uniformity Postulate. In that story THE DESPOILERS the Uniformity Postulate was not denied. The incomprehensible in that story was the mind of a Despoiler. It, to the human mind, was incomprehensible; and to the Despoiler, the human mind was incomprehensible. Each viewed the Universe differently due to a difference in whatever lies at the foundations of the thinking processes. In other words, uniformity of the principle of thought was denied there. Both the Despoilers and Man had mechanical civilization and science, but due to their different minds neither could comprehend completely the viewpoint of the other ON THE SAME THING. Each had applied his REASON to the disorder of nature and constructed what to him was a REASONABLE PICTURE. The type of mentality I attributed to the Despoiler may be impossible. It may be that if the human race eventually reaches out and encounters other intelligent races it will find that the basic principles which result in thought as we know it are the ONLY basic principles that can give rise to thinking intelligence, so that wherever we find civilization we will find creatures that think the same as we do, and have seen the same pattern in nature that we have.