When you close your eyes and press on your eyeballs, you se…

When you close your eyes and press on your eyeballs, you see patterns like this!
This actually has a name: the "phosphene phenomenon."
It's the phenomenon where, when you press on your eyes, you see geometric patterns or ripples of light, and I think quite a lot of people have experienced it.
The cause is that pressing on the eyeball mechanically stimulates the photoreceptor cells in the retina.