Lots of tiltshift photos gathered together in one place.
I can only see the dancer going clockwise. Jessica saw anti-clockwise at first but was then able to change direction. I can't do that.
Scroll down to see "Anamorphic illusions drawn in a special distortion in order to create an impression of 3 dimensions when seen from one particular viewpoint." Insanely great.
An optical illusion; a mind hack, if you will.
This is the most amazing optical effect in the world... or at least a good mind hack.
If Holbein had been a street artist, the results might have looked something like this.