What you describe is actually a controversial thing. You are describing a "naked singularity", it doesn't matter what exactly is spinning, but the theory is: a

What you describe is actually a controversial thing. You are describing a "naked singularity", it doesn't matter what exactly is spinning, but the theory is: anything with a singularity in the middle, that is spinning fast enough, would become a torus, and the singularity would be exposed. Problem is, IF, those are possible (noone is sure yet), they create a huge problem for physics: as far as we know, singularities destroy information and what comes out of them is random, if naked singularities are possible, ANYTHING is possible, and if ANYTHING is possible, physics is meaningless. Seemly in the 70s Stephen Hawking gave a mindblowing talk about that, and Ringworld author was present on that talk.