István Orosz makes prints that are beautiful on their own, but when you place a cylindrical mirror on the surface, a hidden image is revealed. Secretly, the illustrations contain anamorphic portraits of famous men.
Orosz, who also goes by the pseudonym Utisz, is often compared to MC Escher because of his mathematical works and optical illusions. (We've featured his hidden skull illustrations in the past.) Many of his anamorphic works look like ordinary prints until you introduce that all-important mirror. The results are pretty incredible. You can see more of his works, anamorphic and otherwise, at his blog and on Facebook.
Below is a top view of the Edgar Allan Poe image at the top of the post: