When things like this exist?

http://i.imgur.com/I72qO.gif


Clearly our brains can be tricked into interpreting data incorrectly, and yet we take this unwavering pride in them, as though they are infallible.

[it's not letting me embed the picture directly...i'll try again later. EDIT: I was able to embed a still of the .gif, but click on the link to see the actual motion]