Championed by Susan Sontag on its release, Persona is widely regarded as one of the most striking films ever made and considered by many to be the quintessential 1960s work from Swedish director Ingmar Bergman. At its core the film focuses on the relationship between a famous actress, played by Liv Ullman and who for undiagnosed reasons has stopped speaking, and the nurse, played by Bibi Anderson, charged with her care. As the film unfolds and the bond between the pair becomes ever more intense their individual identities are thrown into question. Minimalist in construction and shot in a stark black and white by Sven Nykvist, Persona remains a mesmerising piece of cinema.