He did not know anything about the invisible radiations beating down upon him, soothing and dimming his brain, so that it would never question or doubt, or observe too closely the incongruous circumstances that must often appear. The lack of traffic in the street without, for instance--and the lack of people besides himself and Betty. He didn't know that this machine-shop was built from his own memories of the original. He didn't know that this Betty was of the same origin--a miraculous fabrication of metal and energy-units and soft plastic. The trees outside were only lantern-slide illusions. It was all built inside a great, opaque dome. But there were hidden television systems, too. Thus Loy Chuk's kind could study this ancient man--this Kaalleee. Thus, their motives were mostly selfish. Loy, though, was not observing, now. He had wandered far out into cold, sad sea-bottom, to ponder. He squeaked and chatted to himself, contemplating the magnificent, inexorable march of the ages. He remembered the ancient ruins, left by the final supermen. "The Kaalleee believes himself home," Loy was thinking. "He will survive and be happy. But there was no other way. Time is an Eternal Wall. Our archeological researches among the cities of the supermen show the truth. Even they, who once ruled Earth, never escaped from the present by so much as an instant...." THE END PRINTED IN U. S. A. Transcriber's Note: This etext was produced from _Amazing Stories_ April 1956 and was first published in _Amazing Stories_ November 1942. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Minor spelling and typographical errors have been corrected without note. End of Project Gutenberg's The Eternal Wall, by Raymond Zinke Gallun