voyeurism and obsession

His masterpiece 'Peeping Tom' is a landmark exploration of voyeurism and the camera's complicity in observing others, examining the psychology of a killer who films his victims.

De Palma's thriller aesthetic—from 'Blow Out' to 'Body Double'—repeatedly explores voyeurism, obsession, and the unreliable gaze of protagonists drawn into dangerous observation.

His films like 'Funny Games' and 'Cache' interrogate the viewer's own complicity in voyeurism while depicting characters consumed by obsessive surveillance and hidden threats.