I remember reading something concrete last year maybe was this: https://www.wolframphysics.org/bulletins/2020/05/event-horizons-singularities-and-other-exotic-s

I remember reading something concrete last year maybe was this: https://www.wolframphysics.org/bulletins/2020/05/event-horizons-singularities-and-other-exotic-spacetime-phenomena/ https://www.wolframphysics.org/bulletins/2020/05/event-horiz...