 In the absence (or, rather, the superabundance) of global hypersurfaces, which are defined in terms of coordinate time, becoming in Minkowski spacetime may be thought of locally, as the advance of proper time along a timelike worldline or, even more basically, as the successive happening of events along such a world line. The passage of time or temporal becoming (along a given timelike world line, of course) will be directly indicated by a clock, albeit an ideal clock.