In string theory, some of the higher dimensions of space are closed as in a cosmologically closed universe, whereas the three dimensions we experience everyday are open, or at least, are much, much larger than the dimensions around which the strings loop and vibrate.
Why should this be the case? Why should the universe, forged by the mechanisms of the Big Bang, treat 3 of the dimensions of space differently from the other 8 (ish) dimensions? Probably has something to do with the creation of a force, namely gravity, which "likes" only 3 dimensions of space.
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