- (Premise) Only an actually existing event can be seen.
- (Premise) A wholly past event can be seen.
- Therefore, a wholly past event can be actually existing.
- (Premise) If presentism is true, a wholly past event cannot actually exist.
- Therefore, presentism is not true.
One might want to make the stronger claim that all the events we perceive are past. I don't know if that's true. Maybe we can have direct perception of the future. Maybe a tennis player's noninferential predictions of future ball positions are like that. Moreover, even if that were true, the presentist only says that no wholly past event is actual. Many of the events we perceive are both past and present—we can only see them because they are in part past, but they are still going, and hence in the future.