Are you looking up this chess set or down on it ?

Click on the image for an explanation.

This ad appeared in the British Yellow Pages The title is of course already double in itself. But if you turn the picture upside down and cover part of it, you can see a young girl fingering herself. I think this is the most convincing example of a subliminal ad, possibly also a joke. What else would the picture of a drinking woman be doing on an ad for flooring ?

 

This is a great illusion ! Look at the black dot in the middle and move you head forward and backward. You will see both circles rotating in different directions ! How does it work ? If you move further away, the circles will become smaller for you. This means, from your point of view, every symbol moves inwards, and their slanted edge give the impression of circumferential motion. If the edges are not slanted enough, the illusion doesn't work near as good.

If you let your eyes wander over the picture, it seems to pop in and out.