The feeling of the passage of time—our perception of change—is also a mental construct. To the neuroscientist this construct is correlated with reality: we perceive waves crashing and birds diving into the water because time is actually flowing—these events are unfolding in a universe in which only the present is real. To many physicists and philosophers the flow of time is also a mental construct, but of something that holds no equivalent in the physical world. Within the block universe of eternalism our feeling of the passage of time is more akin to the visions of a schizophrenic, something
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