"Persona" is considered a pictorial radical film. Both Bergman and his cinematographer Sven Nykvist felt that mid-shots was boring, therefore the film consists of a few wide shots, occasional mid-shots and many, long and intense close-ups.
In the spring of 1965 Bergman was admitted to the Sophia Hospital, Stockholm, for double pneumonia and acute penicillin poisoning. While hospitalized, he created the basic script of "Persona". Inspired by August Strindberg's one-act play "The Stronger", an existence which consisted of dead people, brick walls and some dreary park trees and conceived as a sonata for two instruments.