Julian Beever is an English chalk artist who has been creating chalk drawings on pavement surfaces since the mid-1990s. His works are created using a projection called anamorphosis, and create the illusion of three dimensions when viewed from the correct angle.
This guy has an amazing ability to capture a three-dimensional perspective and project it onto pavement. You can see that he is very creative with his applications as well. It seems a shame to think that many of these have washed away by now!
Here are some of my favorites: