Double Imaged Paintings?

Take a look at this image. Is there three pillars or two? Also, where does the middle column end. I found this image along with many others at http://www.reallywarped.com/CoolArt.htm. Some of the images I have seen in school by guest speakers. Some of these illusions make me wonder whether the artist tried to make them appear as an illusion or whether they drew a particular picture or graphic and noticed strange patterns in illusions after creating the picture.

3D Chalk Drawings

Here is an interesting artist I love to stare at. Julian Beever seems to be incredible at chalk creations on the sidewalk. I have no idea how he does it so well but it really captures my eye. I saw a similar attempt by another artist at the Gateway Mall in Downtown Salt Lake and it almost sucked me into believing I was next to a cliff. Check out the website with some other of Jullian's works. http://www.moillusions.com/2007/12/julian-beevers-new-3d-sidewalk.html. This prison drawing is probably one of my favories of his because it blends in so well with the tiles. You couldn't even tell that the drawing is actually on plane surface.