So I tend to look at one in isolation. Record a few ideas:
a. A film like this that tells a story in a confined space can well show the talent of the screenwriter, narrative rhythm, conflict, use of props, play tricks and wisdom with the audience in a thrilling atmosphere, and hide some can be explored in depth. Movies that come to mind right away are cubes and saws, and the sniper hall has a similar style.
b. Watching this film again, I found that the lack of ink in the engraving of human nature turning evil seems a bit abrupt, maybe it has something to do with knowing the outcome of the story. A new meaning has also been discovered: the cycle, including the dazzling white light at the end, is somewhat religious, and it contains the thinking of the entire human being. The expression may not be complete, but there is such an intention. Then the whole film includes the characterization of people of different occupations, including the indictment of government rules (although the negative is not), including the reflection on the cocoon of the crowd, including the panic of finding a way out, including the desire to get what you want. To the philosophy that "inaction" is the origin, and so on. Of course, these may not be included. The film also doesn't clearly point to anything, which is okay.
c. Small defects, but no major problems. It doesn't say what to tell people, but different people can see or mean different things.
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