"M.C. Escher has fascinated young and old with his unique interpretation of the world around us in his drawings and prints. From impossible worlds to repeating pattern tessellations, Escher shows us the unique harmony and beauty that are in simple things in our surroundings."
on the web
Escher Official Web Site
http://www.mcescher.com/
ArtCyclopedia, Where to Find His Art
http://artcyclopedia.com/artists/escher_mc.html