If what you know about this exuberant, self-regarding movie comes from its countless inferior imitations (from Mazursky’s Alex in Wonderland and The Pickle to Allen’s Stardust Memories to Fosse’s All That Jazz), you owe it to yourself to see Federico Fellini’s exhilarating, stocktaking original–an expressionist, circuslike comedy about the complex mental and social life of a big-time filmmaker (Marcello Mastroianni) stuck for a subject and the busy world surrounding him. It’s Fellini’s last black-and-white picture, and conceivably the most gorgeous and inventive thing he’s ever made–certainly more fun than anything he’s made since. (The only other Fellini movie that’s about as pleasurable would be The White Sheik.) With Claudia Cardinale, Sandra Milo, and Anouk Aimee (1963). A new 35-millimeter print will be shown. Music Box, Friday through Thursday, May 7 through 13.