I like the mathematical construct theory of the universe. The universe exists because it is a logically consistent state of one particular construct. All states of the universe (essentially meaning the distribution of energy/matter within spacetime) exist simultaneously within its mathematical definition. The passage of time is merely a perception from within the construct; past and future states are no different by nature but only when considered relative to an arbitrary present. There could be other universes of different constructs as long as they are logically self-consistent. Maybe it's a little too neat, but why not something elegant? :P
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