Concentrate on the 4 small dots in the middle of the picture for about 30 secs
Then look at a plain wall and start blinking. Who do you see?
(10) Pink and green dots
If your eyes follow the movement of the rotating pink dot, you will only see one color, pink.
If you stare at the black + in the center, the moving dot turns to green.
Now, concentrate on the black + in the center of the picture. After a short period of time, all the pink dots will slowly disappear, and you will only see a green dot rotating - if you're lucky!
These people figured out some way of doing an incredibly distorted drawing so that when they stood a reflective cylinder (cylinder mirror) in the middle of it, the reflection showed the picture as intended. One of these is of Mission San Rafael, the exact view you'd see if I tilted my Nikon digital camera up - Escher portrait lyes inside this photo. Don't forget that other photos are inside of this post. Just click on the title to go inside. This image below is Istvan Orovitz’s Anamorphic Art. It is called Jules Verne’s Mysterious Island. At first glance, the image looks like a shipwreck on a weird-looking island. When a cylinder is put on the print, the reflection looks like Jules Verne!