I'm not sure, and this is a lot of speculation, but I feel like it has to do with the fact that mass/energy is conserved over time (but not in space) [1]. The m

I'm not sure, and this is a lot of speculation, but I feel like it has to do with the fact that mass/energy is conserved over time (but not in space) [1]. The mass now corresponds to the mass in the past/future, which, for example, allows memories to form. In any case, time is still a qualitatively different dimension than space. [1] https://en.m.wikipedia.org/wiki/Conservation_law#Exact_laws https://en.m.wikipedia.org/wiki/Conservation_law#Exact_laws