Balance
In this film, the whole world is a raft in space, containing only four men, who are fishing.
The setting is on a floating platform where a group of evenly and carefully placed men live. Each man is aware that the platform is not stable and in order not to fall to their deaths, they maintain a careful balance of weight to prevent the platform from tipping too far and causing them all to fall. This reasonably harmonious understanding is lost when one man pulls up a heavy trunk. In the ensuing struggle, balance is lost in more ways than one.