The Garden of Torment ∶ Octave Mirbeau ∷ Horrors of Malformed Men ∶ Edogawa Rampo
Last 30 minutes of this are from another planet. Cannot imagine a stronger screen version of this strand of French decadent fiction.
If watched on mute, it's akin to a Meshes of the Afternoon-esque trance film - a somnambulant protagonist wandering through a potent environment and witnessing all sorts of horrid revelations. If watched with sound, it's also that, but slathered in delicious Ed Wood word salad. Rocks.