I understand that everybody already knows about this form of art, but i still find the complexity of the illusion astounding. I am talking about sidewalk art. This link (http://www.huffingtonpost.com/2010/03/01/3d-sidwalk-art-that-will_n_478649.html#s71257&title=Rocky_Road) includes 20 separate pictures of this style of artwork. The artists play with our perception as the obviously two dimensional sidewalk suddenly starts to pop out with a three dimensional image. The images range from elaborate murals to over sized soda bottles. To create these the artist plays with our monocular cues. We know many things from everyday life, such as more distant objects seem smaller, and darker spots are shaded from the light source. Binocular cues are useless because the image is two dimensional in reality.
