Compare prices before you buy. But what's even neater is how, in one of the takes, Hitchcock manages to reorient the fourth wall. For most of the movie, the audience's point of view faces the living room and the chest. But for eight minutes, the camera is oriented from the side, and we see that the chest is up against a wall. It's a deft trick.
Long takes are hard enough, but the choreography is particularly good.
In one scene, Brandon passes through a swinging door into the pantry. When the door swings open, we see him open a drawer. When it closes, the maid asks him a question, and as soon as it open again he answers. To compound the experimentation, Hitchcock does a crazy time compression. The compression is utterly convincing, both in terms of plot and character arcs.