Doppelgängers are the original deep fake. A psychological imperative to sit our identities to accommodate and navigate the larger world. Persona is a Straussian tone poem - atonal and prurient - with no room for a rational plot.
This is Bergman’s world without god or compassion. There is no solid ground or love or even shared reality. Just fear.
Elizabet’s postcard of “The Boy in the Warsaw Ghetto” gives us a clear indication of where such a world leads.