I remember reading this when I was ten - it is a great book!
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Wonderful visual... about the string doubled upon itself.
A man by the name of Townsend Brown developed much the same thought in 1942 when he happened to be handed a postcard that was " wrinkled" and he realized that there were points in a "stacked" universe of various dimensions where it would be relatively easy to pass from one point...directly to another. Interesting to me how men of science , poets, writers and artists are all agreeing on this concept..... perhaps so many years later... which is too bad but still the concept is gaining acceptance. EHD