system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do houseflies get stuck in a closed window when an open window is right beside them? Do they have bad vision?
gpt
Flies have very simple brains. Through their evolution it has been enough to fly towards light; then along came us tricky humans and put transparent glass in their way.

In a similar situation we can observe, learn and devise a strategy to escape. Flies can't, so this is less an issue of vision and more one of brainpower.