La Region Centrale (1971) - Michael Snow 

Here's an idea for a movie: Let's get a camera that can be programmed with a computer to move in weird random ways, then lets put it out in the middle of nowhere in some Canadian wilderness, now lets have the thing run for 190 minutes. I really wonder sometimes just what experimental filmmakers are thinking. Snow's work primarily works because of its length. An experiment like Back and Forth is dizzying in an exhilarating way, the monotony of this film wears you down early. I'd like to be one of those people who agrees that this is the culmination of Snow's early work, but its so damn long I was bored to tears, and then starting weeping because I realized I had another 140 minutes left.