When the Russian director Sergei Eisenstein saw Disney's "Snow White and the Seven Dwarfs," he called it the greatest film ever made. High praise from a man whose "Battleship Potemkin" then topped lists of great films. In "Snow White" (1937), Eisenstein saw a new cinematic freedom: Cartoons could represent any visual an artist could imagine. They were no longer shorts for kids, but worthy to stand beside realistic feature films.