Chelsea Girls

Chelsea Girls is a 1966 American experimental underground film directed by Andy Warhol and Paul Morrissey. Noted for its split-screen presentation and alternating use of color and black-and-white footage, the film features a series of loosely connected vignettes centered on Warhol's "superstars", many of whom were filmed inside New York's Chelsea Hotel. Upon its release, Chelsea Girls became Warhol's first commercial success and is regarded as a landmark of underground cinema for its unconventional structure, improvisational performances, and voyeuristic style. The original cut runs at just over three hours long.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster by Paul Morrissey / Andy Warhol (Public domain).