Here's an illusion that I found pretty amazing... shows us in a very frightening way, how our brains just don't always work properly...
I suggest you look through the whole video, by focusing on the center point. Then look at the video a second time, focusing on the faces... and you'll notice the difference.
I actually saw very horrifying faces, straight from a horror movie. Pointy ears, half human half pig faces, big bulging angry eyes etc...
Strange how the brain that can't grasp something, will automatically turn it into something evil and threatening...
explains a lot of things :p.
They didn't look evil or ugly or alien to me; just grotesquely disproportionate. And when I looked at the face straight on, I pretty much got the same effect, because of the differences in head and hair size, face size, nose size, etc.
This is called the Motion Aftereffect.
they look nothing alike. wierd. the mind plays tricks.
I love the spinning lady. If I blink a lot she switches directions.