Answer
"Out 1", directed by Jacques Rivette, is often regarded as a cinephile's Holy Grail due to its elusive nature and reputation as a cinematic masterpiece. Shot in 1971 but not released until 1975, the film's intricate narrative structure, experimental techniques, and lengthy running time have captivated and challenged audiences, making it a benchmark for avant-garde cinema and a must-see for serious film enthusiasts.