Cartoons
Grant Woolard (fei-long)
A very specific cartoon inspired by Escher's Waterfall. It's a strip from a comic "Quirksmith", which have been running in the Cavalier Daily, the University of Virginia's newspaper.
Artist's deviantART profile http://fei-long.deviantart.com
M.C. Pischer
The image was found at http://fei-long.deviantart.com/art/M-C-Pischer-55280206