As a mathematician, I know that division can be approached in various ways. I am primarily algebraic in my approach, so I tend not to think of division as described above. This also is an abstraction. I think my concept is more easily understood by Julian than yours. Please describe the shape of infinity.
Infinity is ill-defined in the above.
In either case, infinity no more has shape than it has colour. Most likely it is not infinite. In this case the universe would be finite. This is hard to understand, granted. To get really precise, we'd need tensors and Rienmannian geometry.