What innovative concept did German Expressionism introduce regarding identity?

The concept of the doppelganger is central to German Expressionism and reflects the movement's exploration of identity and the human psyche. The doppelganger, which is often depicted as a double or counterpart of a character, highlights the internal conflict and dual nature of the self. This theme resonates deeply in the works of filmmakers associated with German Expressionism, where characters struggle with their identities, often encountering their darker selves or alter egos.

In films like "The Cabinet of Dr. Caligari," the doppelganger serves as a powerful motif that encapsulates the characters' inner turmoil and societal fears, effectively allowing the viewer to engage with themes of alienation and madness. This innovative representation of identity goes beyond the mere surface of character development, delving into the psychological complexities that define human experience.

The exploration of this duality through the doppelganger provides a rich tapestry for understanding identity, making it an essential concept within the context of German Expressionist cinema. Other concepts like the anti-hero, archetype, and holy fool, while noteworthy in their own rights, do not capture the same depth of identity exploration that the doppelganger represents within this particular artistic movement.