I think someone explained it best talking about scale, from the small to the very big, such as looking at atoms, when we look at the world from the very small it seems to be made up of seemingly infinite atomic structures, then we look at the stars, seemingly infinite amount of stars, 400 billion in our own galaxy, 1 trillion in our neighboring Andromeda, but then when we look at the shape of the universe it's just swimming with seemingly infinite galaxies in every direction we look. But, if we were to suppose that this universe has a limit, whatever it'll be, what's to say that whatever scale this represents isn't repeated on a scale so infinite that it's just like atoms swimming in a seemingy infinite sea of atoms, or stars among the stars, or galaxies among all the galaxies, what's to say that our universe, from the big bang epoch through the universal and cosmic expansion and up until the big chill, what's to say that isn't just one of seemingly infinitely similar events that make ours look so infinitely small and insignificant by comparison? Kind of interesting to try to wrap ones brain around.
Or, what's to also say we don't live in a multiverse, sea of infinitely higher dimensions, one where every instance of individualized quantum probability has its own outcome and own set of branching paths, meaning that everything that ever would or could happen (since the beginning of time) already has. Metaphorically, if one were to time travel through a sea of infinite possibilities, maybe attempt to go back in time to assassinate Hitler, he might instead arrive in Berlin to see Hitler giving the I Have A Dream Speech and bring about an everlasting world peace.
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