In german expressionism, stages are PSYCHOLOGICAL REPRESENTATIOS (not real representations) about the characters.
In "Das Cabinet des Dr. Caligari "(1920, Robert Wiene), the attrezzo is a response to the acts of a murder. Everything is CHAOTIC and DISORDERLY, just like his mind and his movements. PERSPECTIVE are also imposible and very hard.
Lights and shadows are also main effects in these films.
