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"There are really four dimensions, three which we call the three planes of Space, and a fourth, Time."
"Really this is what is meant by the Fourth Dimension, though some people who talk about the Fourth Dimension do not know they mean it. It is only another way of looking at Time. There is no difference between time and any of the three dimensions of Space except that our consciousness moves along it. But some foolish people have got hold of the wrong side of that idea. " Chapter 1
The four dimensions of space as described in the book are: