The basic story is of two reporters (Bob Woodward and Carl Bernstein played by Redford and Hoffman) who are investigating a possible government conspiracy relating to the Watergate break-in in 1972. In the scene below, Bernstein (Hoffman) goes to the home of a young woman in order to press her for information. Naturally anyone associated with the conspiracy is going to be tight lipped, which is what Hoffman encounters in the scene.
What's important here are the visual choices made by Pakula and Willis to augment the scene, one that easily could have been a very repetitive and uninteresting series of talking heads in the hands of less competent filmmakers.
The breakdown:

Hoffman enters the home and we see immediately the woman he wants to question, separated from him by the rungs of the staircase. Right off the bat there is a separation between the two; inpenetrable, like the bars of a jail cell.

Hoffman moves into position to talk to the woman. What really got me here is how Hoffman is placed in the shot -- he has framed the woman into an incredibly claustrophobic bit of screen real estate. She has been squeezed into a section about 1/100th the size of the frame.

Reverse of Hoffman separated from the woman by the bars. Again this is a visual separation to support the script.

Here Hoffman moves clear of the bars to open the conversation with the woman. A visual progression where the intensity (repeating pattern of the bars) has been lowered.

Reverse of the woman clear of the bars, but she is still not revealing anything.

Hoffman returns behind the bars and sits on the couch, trying to prompt a reaction from the woman.

The woman remains behind the bars, confined to her small space. Standoff.

Hoffman chooses to wait it out. Note the lighting of the living room here, because it will change as the scene progresses.

Hoffman has waited the woman out, she loses the game and comes out from behind the bars. A huge turning point in the scene, done visually.

The woman enters the living room and takes a seat across from Hoffman. Note the lighting has changed dramatically from before; her side of the room is now much darker and colder. She is casting a heavy shadow. This continues the visual progression in the scene; where before the progression was with line and shape (bars), now it is done with tone (light and shadows).

Hoffman resumes his questioning; note he is on the dark side of the couch.

Hoffman is served a cup of coffee and he moves to the light side of the couch (another progression of tone) next to the lamp.
What has been set up now is a classic interrogation scene. Hoffman asking the questions with a strong single light source over his shoulder.

Continuation of the interrogation scene, where the woman is lit by one source and casting a heavy shadow. The camera has pushed in on her, increasing the intensity. The questioning resumes in these two shots until the final shot.

Final shot of the scene - the woman has given Hoffman a lot of information regarding the case he is trying to build, but still manages to keep some of it hidden from him. This is reperesented (along with her requested anonymity) by the lamp which covers her face. I love this ending shot, it's a bold choice and speaks volumes.
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