[Netheron]

Well, Kant said that there were three dimensions of space, and that that was all there could be, since it was clearly the case that there couldn't be any others.

Special Relativity blew a hole in that. General Relativity nailed the coffin shut. Quantum Field Theory and String Theory are currently dancing on the grave.

[RobbyS]

Relativity is counterintuitive, an intellectual contract on the same order as atomic theory. Kant was right to say that we can only perceive three dimensions. Science as a whole has gone beyond our ability to imagine in the original sense of the word. It has become a code, and only the code-breakers can interpret it.