You aren't really jumping through time, that's the illusion; what you're actually doing is leaving one timestream and jumping to—maybe even creating—another. The second one is identical to the one you just left, including all of the changes you made in it—up to the instant of your appearance. At that moment, simply by the fact of your existence in it, the second timestream becomes a different timestream. You are the difference.

(p. 48) - The Man Who Folded Himself (1973)