"Solaris" is the Russian science fiction film of the novel by Stanislav Lem. The film was produced in the early 1970's by the Russian director Andrei Tarkovsky.
Often compared to Kubrick's 2001, Solaris is a much more brooding, sinister movie, with much of the vivid imagery left to the viewer's imagination. A truly atmospheric film with several moments of cinematic genius.
Anyone who says they love films should see this one.