What do the films Casablanca, Blazing Saddles, and West Side Story have in common? Besides being popular, they have also been deemed "culturally, historically, or aesthetically significant," by the Library of Congress and listed on the National Film Registry. These Amazing Shadows tells the history and importance of The Registry, a roll call of American cinema treasures that reflects the diversity of film, and indeed the American experience itself. The current list of 525 films includes...