system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:When I put pressure on my eyes for an extended period of time I see really cool patterns that alternate. What is that?

Also what are those little squigglies that you can see in the corner of your eyes but never directly look at?
gpt
your eye is full of liquid called the vitreous humour. when you press on your eyes, you're increasing the pressure of that fluid inside the eye; that in turn causes pressure to be applied to the nerves in the back of your eye, on your retina. those nerves get confused and start sending out random signals that you see as cool-ass patterns.