ABSTRACT
Tense theorists and tenseless theorists disagree about what is necessary for real change. Temporal passage is a change in time itself. It is like the flow of water in a river. However, a river's change is a kind of motion—i.e., a change of something's position in space. One distinction already mentioned in the metaphysics of time is between two ways that we think of as the ordering of events in time. McTaggart describes the ordering of the events in terms of two series already introduced: the A-series and the B-series. For many, modern physical theory makes some counter-intuitive claims. However, when it comes to experience, one might think that these counterintuitive claims do not matter. Subjectivity is not the same as relativity. There can be relativity without any subject at all. For example, as discussed earlier, size is relative; Jupiter is larger than Earth; there are no subjects involved in this relation.
