With this the USSR tried to eclipse 2001: A Space Odyssey in terms of cerebral science-fiction. Some critics thought they succeeded. You may disagree now that the lumbering effort is available on tape. Adapted from a Stanislaw Lem novel, it depicts a dilapidated space lab orbiting the planet Solaris, whose ocean, a vast fluid brain, materializes the stir-crazy cosmonauts' obsessions--usually morose ex-girlfriends. Talk, talk, talk, minimal special effects. In Russian with English subtitles. In a two-cassette package, with a letterbox format preserving Tarkovsky's widescreen compositions.