This is not an optical illusion, but it takes advantage of exactly the same principles that make optical illusions work: Our eyes and brain don't scan reality like a camera does. Instead, the brain interprets external inputs, discards what is not important to our survival, and builds its own reality. I won't give you any spoilers. Watch.
It has always blown my mind that our brain can feel so imperfect—yet this is only a symptom of how perfect it is, how efficient it got at processing information through a hundred thousand years of evolution, optimizing our perception to increase our chances of survival.
EmoticonEmoticon