system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the point of having multiple hexagonal cells in the eyes of insects?
gpt
Compound eyes are good for detecting and tracking fast motion, and allow for a very wide field of view, as you can just keep adding more cells as you wrap the eye around the head.  Simple eyes, like vertebrates have, only allow a relatively narrow field of view but allow much higher resolution, allowing the use of much smaller eyes and the ability to see things further away.