This article explores the tradition of fictional films created within other films, a recurring Hollywood practice in which celebrated filmmakers examine and celebrate (or satirise) the industry itself. The technique allows directors to pour their passion for cinema into narratives that explore different eras and aspects of filmmaking.

Key examples discussed include:
– Sullivan's Travels (Preston Sturges) – features the fictional "O Brother, Where Art Thou?", celebrating yet mocking the self-importance of ambitious auteurs
– Sunset Boulevard (Billy Wilder) – a noir examining Hollywood's painful evolution through the fictional "Queen Kelly", which was a real unfinished silent film starring Gloria Swanson
– Singin' in the Rain – explores the transition from silent cinema to talkies through fictional films "The Duelling Cavalier" and "The Dancing Cavalier", highlighting sound's importance in cinema
– The Coen Brothers – paid homage to Sturges by naming their 2000 film "O Brother, Where Art Thou?" and created the 1950s Hollywood satire Hail, Caesar!
– Other notable examples: Mank, The Disaster Artist, Ed Wood, The Fabelmans, Hugo, Once Upon a Time in Hollywood, and The Player