Sighting the First Sense - Seeing is Believing
Offers a breadth of educational tools and resources regarding sight and visual perception. Loaded with interactivity. Interact with optical illusions and see how accurate you are.

Sighting the First Sense
Perception is an awareness of the environment through interaction. Site explains how we peceive our world through our eyes and includes a discussion board for people to share their thoughts.

McBeath Sensation and Perception Lab
Arizona State University psychological experiments on the Internet including auditory, visual, and motion perception topics.