system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do you see colors and distorted shapes when you have your eyes closed?
gpt
When you're eyes are closed, your retinas are still sensing even though they're not actually seeing anything. However, the only type of data that your brain can receive from your retinas is visual input, so the brain puts an image to what you're sensing. (You see more wild colors and images when you rub your eyes while closed, right? That's your retinas sensing changes in pressure and your brain trying to read what they're sensing.)