Links
Convex pentagon tiling problem
Pentagon Tiling -- Wolfram MathWorld
pentagon tiling - Wolfram Alpha
Pentagon Tilings - Wolfram Demonstrations Project
Tiling with Pentagons -- The Mathematical Tourist
The 14 Different Types of Convex Pentagons that Tile the Plane
Equilateral Pentagons That Tile The Plane And Their Different Tilings (Livio Zucca)
Pentagon Tilings David Bailey's World of Escher-like Tessellations
Packing and covering on spherical surface
Spherical Cap -- Wolfram MathWorld
Tiling and packing
Non-convex Tiles (Jaap Scherphuis)
Shape's spectrum : Problem of the Month (April 1999)
Heptiamonds Solutions of a Brain Teaser
2, 4, 6, 8, It’s Almost Time to Tessellate
Pentomizer - Every known tessellating convex pentagon
The Geometry Junkyard - Tilings
Escher
The Official M.C. Escher Website
Math and the Art of M. C. Escher
The Mathematical Side of M. C. Escher
A Tale Both Shocking and Hyperbolic
How did M. C. Escher draw his Circle Limit figures...
Association, etc
The Interdisciplinary Institute of Science
Japan Tessellation Design Association
Society for Science on Form, Japan