I did a little research online and came across lots of great Optical Illusions found in photo, art and graffiti. Most of them you have to take a second look at just to see it right.
Below are a few examples. The first example is by Edgar Müller and his team who took five days to create the optical illusion in the town of Dún Laoghaire, near Dublin in Ireland. Perspective lines drawn away from a single viewpoint give the painting the impression of being three-dimensional. This photo appeared in a recent issue of National Geography.
Click on images to view larger.