Reading the February edition of the New Scientist (about space-time being possiblly quantized in its own right) I read that the event horizon of a black hole is a 2-dimensional entity that may possibly encode all the information to describe the 3- 0r ->3 dimensional universe inside. That is interesting of course but am I right to wonder how the surface of the black hole can be described as 2-dimensional in the first place? In my poor little mind it would only qualify as 2 dimensional (and then only in theory) if it was purely idealised as a surface with zero width. This would be impossible unless the black hole was to exist in isolation to the rest of the universe. To my mind 1- ,2- 3- dimensional obnjects are all idealisations from the established 4- or higher dimensional setup we work in at the moment. That seems to be my main point: I can cope with gazillions of hypothetical extra dimensions but not with any subtraction of those we already seem to be dealing with. Have I got things by the wrong handle somehow or am I just naturally obtuse (or both obviously) ?