 A glance back at Figure 1 reminds us that presentism and possibilism suppose that one plane of simultaneity is uniquely metaphysically important. In the former view, it represents all that exists. In the latter view, it is the locus of becoming, the dividing line between the merely possible future and the actual past-plus-present. The special theory of relativity tells us that there is an infinity of planes of simultaneity passing through any given spacetime point and that no physical test can distinguish one from amongst the lot. What was supposedly metaphysically distinguished is physically indistinguishable. Assuming that we humans are complex physical systems, then we have no way to distinguish the present from amongst the multitude of putative presents.