system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do Octopus know what color they are when they camouflage?

How do they learn what color and texture to turn into if they have no mirrors to see and adapt to?
gpt
The chromatophore cells of the octopus can detect light - basically every individual cell can "see" without using their eyes. They're able to detect what the environment looks like, and then mimic the colors and textures with their skin.