If there's a movie defensible for groundless style, it's 8 1/2, a portrait of a film director's vibrant inner life as a mosaic of memories, dreams, sex fantasies, and ever-surprising images. Marcello Mastroianni, at the height of his star power, managed to make an iconic performance by standing in for Fellini, but the whole cast is ultimately dwarfed by the scope of Fellini's imagination.