) is a never-filmed 1958 screenplay
film director Andrei Tarkovsky
. The screenplay is based on Tarkovsky's year in the taiga
as a member of a research expedition, prior to his enrollment in film school.
Concentrate is about the leader of a geological expedition, who waits for the boat that brings back the concentrates
collected by the expedition. The expedition is surrounded by mystery, and its purpose is a state secret. This screenplay refers to Tarkovsky's year in the taiga, where he was a member of a research expedition prior to enrolling at the film school.
Although some authors claim that the screenplay was filmed, according to Marina Tarkovskaya, Tarkovsky's sister (and wife of Aleksandr Gordon, a fellow student of Tarvosky during his film school years) the screenplay was never filmed. Tarkovsky wrote the screenplay during his entrance examination at the State Institute of Cinematography
(VGIK) in a single sitting. He earned the highest possible grade, excellent () for this work. In 1994 fragments of the Concentrate
were filmed and used in the documentary Andrei Tarkovsky's Taiga Summer
by Marina Tarkovskaya and Aleksandr Gordon.