If each person exists in an unchanging state in the block universe, and the flow of time is an illusion caused by the way memory functions (or by something else, the details are not the point), then how exactly does this sensation of 'now' work? Even if 'now' is a psychological illusion, that still doesn't explain why or how I am experiencing this particular now and not some other now. For example, are there an infinite number of me's at every point in time, all experiencing their own now? Or is there one me that 'travels' though the block universe, experiencing the illusion of time?  'Relation between the psychological and thermodynamic arrows of time' (http://arxiv.org/pdf/1310.1095v1.pdf).