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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
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Impossible technologies required explanation in the 'Thirties; people did not suspend their disbelief as easily as we do today when presented with computer graphics that look real. How can you look into the fifth dimension?
Here's the explanation presented by the author:
Tommy looked at that third mirror, and instantly his eyes ached... He could see the third mirror, but his eyes hurt the instant they looked upon it, as if that third mirror were distorted in an impossible fashion... He could see, though, that somehow that third mirror would reflect his imaginary beam of light into a fourth mirror of which he could see only the edge...
"A mirror of forty-five degrees," said Von Holtz precisely, "reflects light at a right angle. There are four mirrors, and each bends a ray of light through a right angle which is also a right angle to all the others. The result is that the dimensoscope looks into what is a fifth dimension, into which no man ever looked before."
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