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<snip...>If we go along with this idea of a pre-existing dimensional super-set we could then postulate that an (unknown) event and mechanism within that super-set caused the isolation of the region forming our universe from the rest of the super-set. It's difficult to imagine what such an event could be, especially from our point of view within our sub-set, but as this is an issue of hierarchy we might find a lower order example of this mechanism within our own universe. For example, if we think of our four-dimensional space-time universe as being an isolated region of four-dimensional space-time within a five dimensional space-time universe, perhaps we should look for the formation of isolated three-dimensional regions of space-time within our four-dimensional universe.One possible candidate for this phenomenon occurring in our universe could be the formation of Black Holes. In the current model of Black Holes (from our four-dimensional space-time point of view) the rate of time becomes zero at the Schwarzchild radius/Event Horizon, effectively removing one of the dimensions and leaving an isolated three-dimensional region of space(/time?) within our four-dimensional space-time universe. Now because no events can occur without a time dimension, which is required to allow the necessary before/after states that define the occurrence of an event, the implication would seem to be that if a new universe is created within a BH, and starts when the BH is formed, it'll only have two spatial dimensions but be spatially unbounded (not only in terms of it's shape but also because there's infinite two dimensional area within a three-dimensional volume). At the same 'time' it's time dimension would be entirely new, 'current' time having been zeroed at the EH. A pleasing aspect of this model is that we could hypothesize that the energy and matter we see falling into a BH results in the expansion of the three-dimensional universe within it, although such a universal expansion would have to be non-constant and varying over time, due to the varying stream of in-falling energy & matter from our universe. Ultimately, such a universe is likely to evaporate due to Hawking radiation.