Once principal photography wrapped, Warhol and co-director Paul Morrissey selected the 12 most striking vignettes they had filmed and then projected them side by side to create a visual juxtaposition of both contrasting images and divergent content (the so-called "white" or light and innocent aspects of life against the "black" or darker, more disturbing aspects.) As a result, the 6.5 hour running time was essentially cut in half, to 3 hours and 15 minutes. However, part of Warhol's concept for the film was that it would be unlike watching a regular movie because the two projectors could never achieve exact synchronization from viewing to viewing; therefore, despite specific instructions of where individual sequences would be played during the running time, each viewing of the film would, in essence, be an entirely different experience.