Fooling Your Senses:

Links to other sites

Breathing Square

Twisted Cord

Cafe Wall

Neverending Scale

Continuously Rising Notes

Changing Illusions

Shape from Shading (Ambulance)

Sites:
House of Illusions
Vision Experiments from Neuroscience for Kids
Sandlot Science Illusions +
Distortion Illusions
"Nill" Illusions