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____________________ A B C Fig. 1. As P moves along the timeline, P is located at each point on the line for exactly one moment (i.e., for a duration of exactly zero). If P comes to a halt at C, P cannot be said to be in existence at C. Scenario 1: __________ A B C Scenario 2: ____________________ A B C Scenario 3: ______________________________ A B C D Scenario 4: _______________________________________ Infinity A B C D Fig. 2. Four possible scenarios for P's motion across the timeline. ____________________ A B C Fig. 3. P cannot exist at the initial point, A. If P exists "now" (at B), P must have existed before "now" (before B).