"Yes," he said to himself, as he drew a deep breath of the sweet spring air. "I was right; that's it. The fourth dimension is a form of duration in some way correlated with space. I shall have to work that out in the light of the greater knowledge, which Her vanished Majesty has given me, and which I almost attained to in Egypt. Wherefore, existence in a state of four dimensions, or the world of N^4, as I have always called it, is, roughly speaking, one. Time and space are, as it were, two sides of the same shield, and a person living in that world can see both of them at once. Wherefore, past, present, future, length, breadth, thickness, here and there are all the same thing to him. It's a great pity there isn't a fourth dimensional language as well, so that one could state these things a little more precisely. But that, of course, is out of the question.
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