When I began writing the book it was like I went into a dream myself. It was an incredible, incredibly intense experience where for the first three or four months I was just living in this book. And not only that but as I conceived of each one of the 30 dream worlds in the book corresponds to the actual theory of relativity. All the other ones are totally made up and do not correspond to physical reality at all. When I was conceiving and writing each of the dream worlds there was a temptation to try to make it scientifically plausible and I resisted that temptation because I thought it would weigh down the book.

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