[Profpat]

But to answer your question as you intended. There is no center. We need spin to give the sphere more precise coordinates. In our universe, your question is a non-question, because the situation shown does not exist. It is a conceptual delivery in 2D (or in pentaist words: a single Field dimension, 1D) and despite the fantastic visual effects, it misses the depth of reality.

Hi Frederick;

I agree a 2D picture does miss the depth of reality, but I think our imagination can handle the transition between a 2D picture and 4D reality.

Perhaps blowing up a soap bubble would help.

I don't envision our universe having a spin in it's own right. Rather as you and Felix point out, that each galaxy has it's own angular momentum or spin; and therefore it's own personal unique center.

As with the soap bubble I imagine the univese to be balanced between the inner and outer pressure of the void.

Needless to say this image of a universe is conjecture, as who really knows?

Best to you,

Pat