Many films that end up being ostensibly about the process of film making itself and the passionate genius of directors often become bogged down in sentimentality or pomposity. Martin Scorsese’s latest film, Hugo, includes a sequence that could operate as a primer for a Film 101 class, in which two children sit in a library and read from a book of film history. The sequence could be stuffy, a perfunctory information dump, but in Scorsese’s hands it becomes one of the most visually striking moments in a film that contains dozens of gorgeous set pieces.