illusions

Resources:

Optillusions - Amazing Optical Illusions
A collection of riddles and optical illusions of many different forms with thumbnail browsing.
http://www.optillusions.com

Sandlot Science
Interactive optical illusions, games, science projects, fun puzzles, and distortions.
http://www.sandlotscience.com/

Infinite Illusions
Offers Yoyos, tops and juggling equipment. Includes information on tricks, a chat room, and links to different organizations.
http://www.yoyoguy.com/