12 Angry Men. 96 minutes long, black and white, takes place in one room, overly sentimental by today's standards. But an absolute classic.
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Fun fact about the camera work from the Reddit comments:
In the beginning, the camera is above the men as if you are observing them from on high. As the film moves on, the camera descends to their hight. This not only puts you on their level, it allows the actors to address you directly. By the end, the camera is beneath them so you are literally looking up to them. This makes both the men themselves and the decision seem more important.
(Note: this isn't 100% adhered to throughout the film but it was the effect they were going for. It makes the camera essentially the 13th man in the room.)
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