The most unusual volume chalk drawings

With experience in cognitive psychology, I could not agree more that I find illusory figures and other tricks, associated with perception, it is exciting. As our senses aimed at obtaining clear images to the brain, it sometimes leads to the misperception.

Combine this knowledge with the world of art, and you get more and more popular trend in art street paintings: the illusion of three-dimensional image, which is visible only from a certain place.

Below is the 89 images with the "optical illusion" of five key artists. Images of volume and made with chalk.