"A film comedy is assembled with the same precision as the inner working of a watch." With his trademark porkpie hat, floppy shoes, and deadpan facial expression, Buster Keaton (1895-1966) is one of the most iconic stars of Hollywood's silent and early sound eras. His elaborate sets, careful camerawork, and risky pratfalls have been mimicked by film comedians for generations. His short films, including One Week and Cops, and his feature-length comedies,...