Persona (1966)

Young nurse Bibi Andersson temporarily moves to a seaside cottage with Liv Ullmann, an actress who has suddenly stopped speaking, whom she has been charged to care for. While residing there, the two women’s personalities merge in explicable ways. Beyond that explanation, I cannot sincerely explain anything else about the film. The casting of these two actresses is brilliant as they carry enough resemblance to make the twisting of their identities much more eerie.