His instruments and his mind would interpret by the old gradations and scales and concepts. His Universe would still be made of nothing but one-inch rocks, to him, but its behavior would be strange. Perhaps slowly, like a newborn child making sense out of its surroundings, or a foreigner slowly making sense out of our language, he would penetrate to the new reality with his mind. Perhaps in the very process his being would change its structure. In the end he would be in a unique position. He would have the memories of one Reality, and the experiences of a new one. He would have the language of the old with which to describe the new to his old companions. Could he do it so they would comprehend it? It would do him no good simply to invent new words to describe something beyond the experience of his old companions. He would have to describe something beyond their experience with words and sentences they had created to describe only what they had gained from their own experience! How could he hope to make them gain a true understanding of it? He might tell them simply and truthfully everything he experienced--and it might come out utter nonsense! It probably would. Unless he could bring back some of the evidence, either intentionally or unwittingly. At first that evidence might present a pattern of utter nonsense and contradiction with known thought patterns and concepts. It might present seemingly normal events in nonsense sequences. It might present impossible events in seemingly normal sequences. It might even present disjointed events in sequence. What it would present would be only what the screen of the senses and the screen of the mind could accept. Underneath would be a perfectly orderly pattern of events of some sort, behaving according to different natural laws in conflict with those we have existed under. Slowly we might penetrate to an understanding of them, but not at first, because at first they would be completely UNTHINKABLE. In this story, UNTHINKABLE, an attempt has been made to depict such a conflict of nature and human mentality. It is not the ordinary science fiction attempt. It is not new laws working in harmony with old, or new discoveries that fit into the old pattern. It is, if you please, an utterly alien bit of reality in conflict with the old. The story cannot but be inadequate. It is the froth and foam of the struggle. It is the parts that fit into the words and phrases and sentences. You won't like it at all--unless you have the type of mind that can reach a little way beyond experience. And though what you may "see" may have no counterpart in all reality, if this story serves to expand your mental horizons, it has at least found an excuse for being written. --ROG PHILLIPS