7.These pink dots that disappear when you stare at the black cross in the center.
8.Ow ow ow ow ow ow ow.
10.The rotating-mask illusion.
11.This trippy work of art by Regina Silveira.
12.This flexible paper sculpture.
13.This dude who took a 360-degree photo.
14.This train that moves into or out of the tunnel, depending on which direction your mind decides it should go.
15.This water-refraction experiment.
Do your eyes hurt yet? Screen-induced eyestrain is a real thing that affects everyone. So stop staring and go get your eyes checked by an optometrist. It's easy, painless, and your eyes will totally thank you for it.