Akiyoshi's Illusion Pages
Includes anomalous motion illusions.
Colorcube
Illusions organized by category, including blind spot, blink effect, bordering, chromatic adaptation, colorblindness, and others.
Counter-Rotating Spirals Illusion
Java applet, including other illusions, such as an animated Necker cube.
Crazy Images
Interactive animations and optical illusions that respond to user's input.
Eluzions' Optical Illusions
Contains many optical illusions, illustrating a wide range of visual anomalies and surprising optical effects. A free screensaver, posters, and educational explanations are also provided.
Eye Magic
Collection of high quality optical illusions that come with clear explanations.
Eyetricks.com
Collection of illusions and other mind teasing oddities. Includes illusions that you can make.
Eyetricks.com: Optical Illusions
Collection of optical illusions, brain teasers and games.
Illusion Works
A multimedia museum of optical and sensory illusions, with on-line demonstrations and explanations.
Khushboo's Virtual Escher Gallery
Small selection of images by the artist.
M.C. Escher
Optical illusion art, news, history, copyright and foundation information.
Magic Eye Image of the Week
Includes a new image every week demonstrating stereograms.
NIEHS Kids Page -- Optical Illusions
Presented by the National Institute of Environmental Health Sciences. A collection of illusions.
Optical Illusions
Some classic optical illusions with explanations for how they work.
Optical Illusions
From the Department of Ophthalmology and Visual Science at the University of Illinois, a collection of illusions and after images.
Sandlot Science
Interactive optical illusions, games, science projects, fun puzzles, and distortions.
The Exploratorium's Online Exhibits: Seeing
Interactive illusions from the exploratorium.
Visual Phenomena and Optical Illusions
Interactive illusions, including Benham's disk and other illusions involving motion.