Another major theme of "Caligari" is, Stephen Brockmann writes, "the destabilized contrast between insanity and sanity and hence the destabilization of the very notion of sanity itself". By the end of the film, according to Brockman, viewers realize the story they have been watching has been told from the perspective of an insane narrator, and therefore they cannot accept anything they have seen as reliable. The film's unusual visual abstractions and other stylized elements serve to show the world as one experienced by a madman. Similarly, the film has been described as portraying the story as a nightmare and the frame story as the real world. John D. Barlow said the film exemplifies a common Expressionist theme that "the ultimate perception of reality will appear distorted and insane to the healthy and practical mind". The film serves as a reminder that any story told through a flashback subjectivizes the story from the perspective of the narrator. At the end of the film, the asylum director gives no indication that he means Francis ill will, and in fact he seems, to Barlow, to truly care for his patients. But Francis nevertheless believes he is being persecuted, so in the story as told from his perspective, Caligari takes on the role of persecutor.