I am not sure how to form a coherent question about this; I can't figure out how to phrase it: Why are our three dimensions all at 90 degrees to each other? Drat, I can't even form the question. I've been reading about extra dimensions, such as the further 6 postulated in string theory, and how they overlap our current three, so this is not a rudimentary question looking for a rudimentary answer. But I still can't seem to ask the question I want. Every explanation I try to form ends up making the initial assumoption that there are 3 dimensions we have to play with in the first place. I'm going to leave this open for feedback, and clarify my question as I go.