Dutch artist Ramon Bruin, otherwise known as JJK Airbrush creates incredible 3D art that appears to jump right off the paper it's drawn on, blurring the line between art and reality.
If you were to view these in person they wouldn't look 3D, but when the artist photographs them from a certain perspective they appear 3D. The artist also creates multilayered illusions which are crated using multiple sheets of paper that are aligned together. You can check out more of the artists work via their website.
source: Ramon Bruin's website