What's in the middle where the pot isn't?
I'll rephrase the question. What exactly is a torus? It's a surface of revolution generated by revolving a circle in three-dimensional space about an axis coplanar with the circle.
OK, forget that and just concentrate on what it means. Something is everywhere. Period. So a hole of nothing isn't exactly nothing. There is something in that hole, depending on where you put it.
There is a point of view, directed by you.