These drawings are anamorphic drawings, which give the illusion of 3D when viewed from a certain viewpoint. The artist that drew them is Julian Beever and I have to say that he is a pretty amazing artist! It’s hard to believe that all of the drawings below are 100% FLAT.
People are actually walking around the “hole” in the drawing below:
Remember, the artists feet are both flat on the pavement…
Here is the same drawing from the wrong viewpoint:
This drawing is actually 40 feet long, as you can see in the shot taken from the side: