A mathematician and a physicist are sitting next to each-other in a lecture about 11-dimensional space. The physicist scrunches up his nose, tilts his head to one side, and generally appears confused, while the mathematician smiles and nods as the lecturer writes equations on a blackboard. At some point, the physicist turns to the mathematician and asks, “How can you possibly follow this? I can’t visualize more than 3 or maybe 4 dimensions!” To which, the mathematician replies “Oh, it’s easy. Just visualize n dimensions, and then set n = 11.”
