Seeing in dimensions

摘要

Look at the full stop at the end of this sentence. Congratulations: you have just visualised zero-dimensional space. Now run your finger down the edge of the page, then scan it as a whole. Thaf s one and two dimensions - also easy. But now try thinking of more than three.rnCot a headache? If so, you are in good company. "I personally can't picture more than three space dimensions," says string theorist Michael Duff of Imperial College London, whose job regularly takes him into 10 or 11 dimensions, A shocking admission, you might think, How can he and his fellow theorists have any confidence that their ideas work?