 Dorato and Wittman (2015) take as their starting point “the indisputable fact that we share the ‘now; despite the fact we don’t share a ‘here’” (2015, 200), but they propose a different structure as a relativistic present at a point, a sphere around that point of at least 40 ms length. (According to them, 40 ms is the temporal order threshhold. That is, one cannot reliably determine the temporal order of event occurring less than 40 ms apart in time in one’s immediate vicinity. In their view, this sets a minimum bound on the length of the perceived or psychological present.) They add that “… passage physically correspond[s] to a succession of spheres…” (202)