 But this is a characterization of a relativistic present, not relativistic presentism. Presumably every dynamical system that has existed, does exist or will exist had, has or will have a region of whatever size is necessary to sustain it. Furthermore, it is unclear under what conditions two dynamical systems share a present. Even if they are intuitively spatially close, what sustains one may, or may not, sustain the other. While Brading’s suggestion might be developed into a way to define a relativistic present, it may not help to define presentism in a relativistic context, as she intended.