  Since Extensional specious presents comprise earlier and later phases that are experienced together, in a single unified (albeit extended) state of consciousness, it may well be that Extensional models are incompatible with the Presentist conception of time, according to which only what is present is real. For two phenomenal contents C1 and C2 be experienced together, to be diachronically co-conscious, both C1 and C2 must surely both exist. But if Presentism were true, when C1 is present C2 would be non-existent, and when C2 is present C1 would be non-existent. Extensional theorists will not be overly worried by this consequence, which they will construe as a reason for rejecting the Presentist conception of time. See §7.2 for further discussion of this issue.