The ephemeral nature of time, perhaps, is an stubbornly persistent illusion. All the laws of physics work the same if time goes backwards, except the Second Law (of thermodynamics) which doesn’t even have a clear statement. One consequence of the second law is that you remember (even if imperfectly) the past, but cannot remember the future. It’s easy to burn a match, but the match retains a memory of having burned, and it’s impossible to unburn it.
