Glass unsmashing is an emergent behaviour. Even if you were an operator of a simulation of that glass being smashed, you could never change the rules so that th

Glass unsmashing is an emergent behaviour. Even if you were an operator of a simulation of that glass being smashed, you could never change the rules so that the glass would come back together like it was. Time is not some parameter you can adjust. Time is just a word we have to express amount of quantum interactions that happen to an object. That's why I don't imagine reversing time. It makes no sense. You can't reverse effects of interactions even if you reversed the laws of nature. And you can't record reality and play it backwards too.