I found a longer quotation.

Lumet - 12 Angry Men — Evan DiLeo

It never occurred to me the shooting an entire picture in one room would be a problem. In fact I felt I could turn it into an advantage. One of the most important dramatic elements for me was the sense of entrapment those men must have felt in that room. Immediately a 'lens-plot' occurred to me. As the picture unfolded, I wanted the room to seem smaller and smaller. That meant that I would slowly shift to longer lenses as the picture continued. Starting with a normal range (28mm-40mm) we progressed to 50mm, 75mm and 100mm lenses.

In addition, I shot the first third of the movie above eye level. And then, by lowering the camera, shot the second third at eye level and the last third below eye level. In that way, by the end, the ceiling began to appear. Not only were the walls closing in, the ceiling was as well. The sense of increasing claustrophobia did a lot to raise the tension of the last part of the movie.

On the final shot, an exterior that showed the jurors leaving the courtroom, I used a wide angle lens. Wider than any that had been used in the entire picture. I also raised the camera to the highest above eye-level-position. The intention was to literally give us all air, to let us finally breathe, after two increasingly confined hours.

That's pretty awesome filmmaking

Purchased. Thanks for the recommendation.