The Forest Has Eyes

When you first look at this picture all you tend to notice is a guy riding through the forest on a horse with another horse behind him. After a few seconds you start to notice that there are faces hidden throughout the forest that are all looking at the man. The book tells us that there are 13 faces and that we should e-mail the author to find out all of the other faces but all i did was look on google to find the rest of them. Figured I would save everyone some time. The reason that these changes occur is because of perceptual organization. Our brain's organize these rocks and trees into faces so that they are easier for us to recognize. Another thing that I thought was interesting was that once you notice that something in the picture is a face it is hard to see it as just trees again. No matter how hard I try I can't stop seeing all of the faces. This is the site I found the answers on. http://www.bnr-art.com/doolitt/foresteyes.htm