Briefly elaborate what this expressionist form consists of and how it reflects the movement

This essay should be about 750 words long, double-spaced, with one-inch margins. It should address the topic below.

According to Siegfried Kracauer, the film The Cabinet of Doctor Caligari by Robert Wiene (1919) was revolutionary not only because of its expressionist form but also because of its political message. In your essay, briefly elaborate what this expressionist form consists of and how it reflects the movement as a whole. Then relate these general characteristics of Expressionism to the formal characteristics of Wiene’s film and to the film’s sociopolitical “message.” This will require you not only to reflect upon the overall situation in Germany at the time, but also the comment upon Kracauer’s view that the narrative frame added later to the film completely undermines its revolutionary impulse.