In the autobiographical documentary Voyage in Time (1983), Tarkovsky says he viewed Solaris as an artistic failure because it did not transcend genre as he believed his film Stalker (1979) did, due to the required technological dialogue and special effects.- Stalker (1979 film) (Wikipedia)
Stalker (Russian: Сталкер, IPA: [ˈstaɫkʲɪr]) is a 1979 Soviet science fiction film directed by Andrei Tarkovsky with a screenplay written by Arkady and Boris Strugatsky, loosely based on their 1972 novel Roadside Picnic. The film tells the story of an expedition led by a figure known as the “Stalker” (Alexander Kaidanovsky), who guides his two clients—a melancholic writer (Anatoly Solonitsyn) and a professor (Nikolai Grinko)—through a hazardous wasteland to a mysterious restricted site known simply as the “Zone”, where there supposedly exists a room which grants a person’s innermost desires. The film combines elements of science fiction and fantasy with dramatic philosophical, and psychological themes.