Decasia is quite unlike any other movie you will ever see and I found it mesmerising but very disturbing. It's almost the stuff of nightmares... not obviously terrifying or shocking but it's unsettling and it gets under your skin.
It was edited together from found reels of old, damaged and decaying film; the images are distorted, unclear and the decay is as much a part of the picture as the imagery the cameraman originally captured. Often the same footage is repeated over and over again, creating a surreal vision of ghostly images locked in a cycle until, presumably, decay releases them. This effect is particularly disturbing when the ghosts are nameless people, presumably long dead, whose images are now inevitably fading away.
The original music score by Michael Gordon is constant throughout the movie and its repetitive, dischordant tones meld perfectly with the imagery, taking the visual experience to another level.
Decasia is more of a cinematic experience, a work of art, than a movie. It's certainly not enjoyable in the traditional sense but it is deeply effective.