Rendered Escher
Matthew Everett, Jeffrey Mancuso
A computer version of Escher's litograph "Reptiles" by Matthew Everett and Jeffrey Mancuso
The model of the litograph was created for rendering competition in Stanford University in 2001. You can see the same scene from another point view below.
These images were found at
http://graphics.stanford.edu/courses/cs348b-competition/cs348b-01/escher/