Sites in English:
				http://www.tess-elation.co.uk : Reviews, methods, escher,
				essays and a lot of articles. The very informative site of David Bailey.				
				
 https://hedraweb.wordpress.com/ : The tiles of Dave Smith who discovered the mythical aperiodic tile, 
				nicknamed the EinStein, sought after for 50 years by tessellators around the world.				
				
 https://tiled.art/ : The great site of Rick Mohr. Discover great tessellation art, understand how it works, and create your own on line.
				
http://tessellations.org : One of the two main sites dealing with tessellations.
				All aspects of tessellations and their history. Galleries and workshops.
				
 http://k4.dion.ne.jp/~mnaka/home.index.html : 
				Tessellation World of Makoto Nakamura, a really great "tiler" artist.
				
http://ozbird.net : 
				Periodic and non-periodic tilings, the inventive art of John A.L. Osborn.
				
 http://www.josleys.com/galleries.php?catid=6 : 
				Marvellous Mathematical Imagery by Joe Leys. His escher flavoured pages. Where we find impossible geometry, tessellations, circular limits and even the Droste effect.
				
https://kickstarter.com/projects/mathspace/tessellation-masters-puzzle-series :
				Wooden puzzles with artwork from masters of mathematical art from around the world. Beautiful and particularly inventive puzzles.	
				
 https://mcescher.com/ : The Official M.C.escher Website, published by the M.C.
				escher Foundation and the M.C. escher Company B.V.
				
 https://scottkim.com/ : Designer of visual thinking puzzles for web and
				print.
				
https://ics.uci.edu : A marvellous source for all those 
				who take an interest in geometric curiosities.
				
 https://ambigr.am : The new ambigram online magazine of Kai Hammond.