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In the page Universe, it is say that "While a common higher dimensional space is the most frequent way of separation, many other ways exist and are also valid.", so i'm wondering what are these other ways, since as the page says a space separating 2 universes and being of the same dimensionality as these universes would just be a part with these universes in an even larger universe, so how could there be spaces separating universes that are not higher-dimensional spaces ?