The balloon analogy is a good one because it implies that there is no actual centre in 4 dimensional space, which is clearly the case. The centre of space would also be the "centre of time". If you were to travel around the outside of the balloon (theoretically), you could come around to the same point. But remember the surface of the balloon is 4-dimensional so you'd have to do some time travelling as well. Weird. Confusing...all of the above.
Kashi
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