If you stare at the spinning dancer below, at some point your visual perception will shift and she'll start spinning in the opposite direction! I didn't believe it at first, but then it happened and she just changed back and forth! Pretty Cool. See if you can make her change directions!

You always have to kind of look and not look at the same time to see those -if you don't move your eyes in deep concentration it can not happen
. Although I am still skeptical with this one - is it really changing direction by "illusion" or it is actually changing direction with help of computer graphics...hmmm....