Stalker
A film that creates more questions than answers, Stalker is one of the most ambitious works of art in motion picture history. It is also one of the most influential. Cooked over low heat, it shows the level of degeneration that the human race has reached, as well as the sudden change between relationships of equals, now characterized by hostility and mistrust.
This is Tarkovsky's last humanly-perfect masterpiece that uses the science-fiction genre as a perfect excuse for enlightening both the beauty of cinema and the vastness of the human mind. The Zone is just the quiet motor that symbolizes the rabbit hole.