For three years during the 1920s, in an attic in Potsdam, a young woman crafted what is today the oldest surviving animated feature film. Equipped with scissors, cardboard, sheets of lead, glass panes and a camera, animation pioneer Lotte Reiniger filmed Die Abenteuer des Prinzen Achmed (The Adventures of Prince Achmed) using a technique of frame-by-frame silhouette animation she developed, inspired by Chinese shadow puppetry. As the result of a number of factors--her gender, her German ethnicity, World War II and a lack of funding--Reiniger became a footnote in animation history. Yet...