I couldn't find the article, but there's a theory that states something to the effect that black holes are only 2D and the rest of the universe is a holographic

I couldn't find the article, but there's a theory that states something to the effect that black holes are only 2D and the rest of the universe is a holographic projection. They back some of this up by noting that the size of the event horizion of a black hole grows as a function of 2D mathematical spaces rather than 3D spaces.