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"I especially appreciate the way everything very clearly looks like it exploded out of a central point."

No, that is not how it works. What you see in the model is our point of view. Whats closest to us is moving away slowly, what is further away is moving away faster.

If you choose any random point (you cant really, we are stuck here) and start your model there it would be similar but centered at your new point of observation.

Any random two points in space (in this model) will be moving away from each other with a speed that correlates to the distance between them (unless the two points are close and local conditions prevail temporarily).

The question of a "center of an explosion" and "where is it now" makes no sense. Everything that now is was in that centre, so now the center is everywhere (according to our current best model).

Good explanation.

A way to demonstrate it is to inflate a balloon a little, draw dots on it at intervals, then inflate the balloon.

From any dot you look at, all other dots are moving away from it.

Ah, so the central point in the model is where we're located. Is that right?

I wonder why things are only visible to us on the left and right like that. If I understand correctly (and I probably don't) she said the dark areas are not observable. Why would that be?