In my writing I am acting as a map maker, an explorer of psychic areas, a cosmonaut of inner space, and I see no point in exploring areas that have already been thoroughly surveyed.
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Changes... can only be effected by alterations in the original. The only thing not prerecorded in a prerecorded universe are the prerecordings themselves. The copies can only repeat themselves word for word. A virus is a copy. You can pretty it up, cut it up, scramble it - it will reassemble in the same form.