リンク
凸五角形タイル張り問題関連
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
球面の充填・被覆の問題関連
Spherical Cap -- Wolfram MathWorld
タイル張り・充填関連
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
エッシャー関連
The Official M.C. Escher Website
Math and the Art of M. C. Escher
スーパーエッシャー展(2006~2007年に開かれた展覧会)
Waterfall (YouTube)…メカニカルなトリックのようです
The Mathematical Side of M. C. Escher
A Tale Both Shocking and Hyperbolic
How did M. C. Escher draw his Circle Limit figures...
学会・知人など
The world of Makoto Nakamura(中村誠さんのサイト)