In this chapter, we learn that the autumn equinox is the same day and night as the day and the night. This means that everything in the world is half-truths, half-imaginations, and half-obscures. This is why the police are called "the half police" in the first place. They're supposed to enforce the laws of physics, but they don't know how to do their job. They can't be completely sure that everything is half right or half wrong, because there's no way to be absolutely sure of everything. They should be able to be sure that a person is half alive or half dead, because that's the only way to know if something is half true or half false. In other words, it's better to be completely certain of something than to be half-certain of something. The half police are supposed to be the first line of defense against the evil forces of nature, and they're the ones who can stop them from spreading false information about the world.