ELI5: Explain Like I'm 5

Closed-eye hallucination

Closed-eye hallucination is when you see things with your eyes closed. It's like playing a movie on the inside of your eyelids, but it's not real. Even though you can't really touch what you're seeing, it will seem like you're seeing real things, like people, colors, and shapes. Your brain is making up the images without any help from your eyes.