Andrei Rublev
The film references Tarkovsky's 1966 film "Andrei Rublev" by having an icon by Andrei Rublev being placed in Kelvin's room. It is the second of a series of three films referencing Rublev, the last being Tarkovsky's next film, "The Mirror", which was made in 1975 and which references "Andrei Rublev" by having a poster of the film hung on a wall.