http://www.zefrank.com/dtoy_vs_byokal/  Make your own kaleidoscope

http://www.andreaplanet.com/andreamosaic/artworks/  Photo mosaic generator

http://www.smithsonianmag.com/games/?no-ist  Smithsonian Magazine puzzles

http://www.bassfiles.net/eye/  Watch the eyeball follow your pointer--silliness!

http://www.michaelbach.de/ot/index.html  Michael Bass's collection of optical illusions

http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/  Powers of 10--fascinating!

http://www.darkroastedblend.com/2010/09/mind-bending-optical-illusions.html  Optical Illusions 

http://www.worldcat.org  Find libraries near you that have the books you want to read