Today, I came across an article which says that the Universe began with the collapse of a 4-dimensional [spatial] Universe. Well, I don't know if there's any way to confirm these like it is with all other theories which deal with before the Big Bang.
The strange thing was that the article mentioned about 2-dimensional event horizons. Quoting from it :
In our three-dimensional [spatial] universe, black holes have two-dimensional event horizons -- that is, they are surrounded by a two-dimensional boundary that marks the "point of no return." In the case of a four-dimensional [spatial] universe, a black hole would have a three-dimensional event horizon.
Why does the article say that black holes in 3 [spatial] dimensions have 2-dimensional event horizon. I will reach the "point of no return" no matter from what direction I approach, right? Is something missing here?