The Quiet Power of the Single Location
Give a filmmaker a limitless budget and a globe to roam, and they will often make something forgettable. Take the globe away and the work gets honest.
12 Angry Men is the classic case. A jury room, a hot afternoon, a vote that begins eleven to one. Nothing is shown of the crime, and still the film feels enormous, because every cut is a decision about whose face matters right now.
Room goes further. Its first half is a single shed, shown through the eyes of a five-year-old for whom it is the whole world. The film makes that space feel complete and safe, which is exactly what makes the second half so hard to watch.
What a single location does best is concentrate attention. With no travel and no scenery to lean on, performance, framing and sound have to carry everything. When it works, you stop noticing the walls.