Does anyone have any good online references to physicists' theories on why we experience ourselves as moving into the future? In one sense it seems silly. If time passes at a constant rate, then what is that rate, what even are the units of that rate? One second per second?? I had assumed that entropy could explain why we can remember the past but only make hazy guesses at the future. For example: Suppose the universe starts as a single cube of ice, 1m wide (call this state A). Notice that it is very low entropy and also very easy to describe. It melts and cracks to become a much more complicated configuration (state B). State B could potentially include a memory of state A for example a smaller ice cube. Since State A is simpler than state B, it cannot contain a version (or memory) of it. Could this act of including memories from the past into the present give us the sensation that we have just come from the past?