Try to concentrate and count the number of faces shown in this picture:)

Are there really only flowers?

What’s that: the word “liar” or a face?

Dr. Jekyll and Mr. Hide scary illusion.
Step away from your computer screen. You should see the two faces swap over! Come closer to the screen again and they swap again. Spooky, isn’t it. This hybrid image was created by Phillippe G. Schyns and Aude Oliva of the Univ. of Glasgow. It proves that we may not be seeing what’s actually there, all the time.

There is nothing moving on the picture. (© Akiyoshi Kitaoka)