One would think that the use of the camera subjectively—that is, as one of the characters—would for many years have been as basic a movie device as the close-up, but few people try it and Hitchcock is nearly the only living man I can think of who knows just when and how to. He is equally resourceful, and exceptional, in his manufacture of expressive little air-pockets of dead silence.
James Agee
August 17, 1946