Dr. Edward Barron has a theory that time is arranged like a series of particles that can be traveled up or down; his colleague and hesitant collaborator August Pointdexter isn’t so sure about the application of the theory to reality.
An elevator doesn’t involve paradoxes. You can’t move from the fifth floor to the fourth and kill your grandfather as a child.

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  1. “Blank!” by Isaac Asimov, in Infinity Science Fiction, June 1957.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Isaac Asimov