This is an interesting definition of symmetry, "symmetry across time" being one way I never thought about it.
But if something is symmetrical in space, it's a mirror image, right? Like, most human faces are roughly symmetrical. But in time, I'm not sure if the "mirror" effect happens? That part goes over my head. Very cool video though, the visuals are really fun to watch.
Space and time.. hmm, have u watched this before? Doesn't help with anything, but just interesting food for thought lol.