Indeed. Furthermore the struggle to comprehend and accept that a person consists of multiple "personas."

As you may already be aware, this film was conceived by Bergman during a moment of psychological crisis, when he was questioning himself as an artist. So alot of the film can be interpreted through that lens as well. In other words, the film can be interpreted as the internal strife of a filmmaker, where Bergman is trying to re-learn filmmaking or, better said, merge his old ways of filmmaking to a new mode he allowed himself to explore after his psychological crisis. Not everything is neatly resolved, but its the willingness to take the journey that counts! Hope this makes sense.

I did know , this came when he was in hospital but was totally unaware of any psychological crisis.That definitely gives new perspective , need to read upon what happened there. In just film's universe though it draws lot of possible theories to expound upon.This remains my favorite bergman.

Apparently Bergman was questioning which direction he wanted to go as a filmmaker, and this exploration is peppered throughout "Persona." It is most revealing: (1) at the beginning of the film with young boy and screen; (2) the title sequence; (3) when Liv Ullman character views the documentary footage of the burning man on the TV screen; (4) and in the middle of the film when image dissolves and burns and a silent slapstick comedy emerges.

"Persona" is great because it works as a psychological thriller but also has this underlying philosophic exploration about filmmaking and film as an art form -- the "Persona" of filmmaking. Very clever and very moving.