You may know all about aspect ratios, but are you aware of the people in events in film history that guided their evolution? Just in case you skipped film school, FilmmakerIQ.com offers a crash course in the shape of your screen. (Hitchcock shot North By Northwest, pictured, in VistaVision, which was projected at aspect ratios ranging from 1.66:1 to 2.00:1, depending on the theater.)