try looking at this static image and tell me if the face looks indented or sticking out:

the true reality of this image is that the face is indented in, but do to the cues and lighting and whatnot, most see the face as sticking out and can't for the life of them see it as an indentation. if you do see it as indented in, they claim that means you have schizophrenia.

https://www.youtube.com/watch?feature=player_embedded&v=QbKw0_v2clo