The Wonderful World of Optical Illusions

You may well remember that japanese guy's gif of a dancing ballerina:

Does she turn clockwise or in the opposite direction? The answer is at the bottom of this post.

Next one is called «Impossible Motion: Magnet-Like Slopes»:

Anamorhic Illusions:

The "Moving" Corridor (static picture):

The Violet and the Green Waves (static):

Amazing T-Rex Illusion! Just laugh at this:

The "Moving" Particles:

Yes or No?

And, finally, the ballerina (but is she not just a young woman and maybe naked ?) part:

Enjoy;)