Categories
Aesthetics

Games & Puzzles

http://en.wikipedia.org/wiki/Category:Word_games

http://en.wikipedia.org/wiki/Constrained_writing

http://en.wikipedia.org/wiki/Category:Mathematical_games

http://en.wikipedia.org/wiki/Category:Surrealist_games

http://en.wikipedia.org/wiki/Category:Surrealist_techniques

http://en.wikipedia.org/wiki/Category:Artistic_techniques

http://en.wikipedia.org/wiki/Optical_illusion

http://en.wikipedia.org/wiki/Category:Optical_illusions

http://en.wikipedia.org/wiki/Category:Optical_phenomena

http://en.wikipedia.org/wiki/Category:Optics