Akiyoshi's illusion pages
   Many works of Akiyoshi Kitaoka. Designs around standard illusions crafted to maximise the illusory effect.
   http://www.ritsumei.ac.jp/~akitaoka/index-e.html

All In Fun Magic
   Over 50 optical illusions and ambiguous drawings.
   http://www.allinfunmagic.com

Amazing Eyetricks
   Gallery of pictures that will trick your eyes.
   http://www.fun4all.dk/eyetricks/

Amos Storkey - Visual Illusion of the Month
   Collection of illusions and images chosen for novelty and distinction from the usual set found in most collections.
   http://www.anc.ed.ac.uk/~amos/visualillusion.html

Braingle's Optical Illusions
   Dozens of optical illusions to tease your brain.
   http://www.braingle.com/brainteasers/optical-illusions.php

Cool Optical Illusions
   A growing collection of optical illusions and eye tricks, including original illusion pictures and a collection of optical illusion desktop wallpaper.
   http://www.coolopticalillusions.com

Cut the knot: Visual Illusions
   A collection of about 20 illusions - all accompanied by Java applets. Interactively changeable attributes help investigate which ones are in fact responsible for tricking the brain.
   http://www.cut-the-knot.org/Curriculum/index.shtml#illusions

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.
   http://eluzions.com/Illusions/

Eye Magic: Optical Illusions
   Offers a number of optical illusions for viewing, as well as explanations on how they work.
   http://www.harmsy.freeuk.com/eyemagic.html

Eyetricks.com
   Optical illusions, 3D stereograms and anaglyphs, fractals and brain teasers
   http://www.eyetricks.com/

Free Optical Illusions Website
   A selection of optical illusions including an optical illusion quiz.
   http://www.illusion-optical.com/

IllusionWorks
   A multimedia museum of optical and sensory illusions, with online demonstrations and explanations.
   http://psylux.psych.tu-dresden.de/i1/kaw/diverses%20Material/www.illusionworks.com/

Mchael Bach: Optical Illusions & Visual Phenomena
   The stress here is on relative novelty and interactivity, in combination with a scientific background. Regularly updated.
   http://www.michaelbach.de/ot/index.html

Mindfake.com
   Site contains a collection of optical illusions, online games, and other fun things.
   http://www.mindfake.com

NBCreations illusions
   Illusions by Brincat Norbert for viewing and downloading.
   http://nbcillusions.100freemb.com

Optical Illusion Archive
   A collection of optical illusion images, 3D street art, and flash demonstrations.
   http://www.unoriginal.co.uk/optical1.html

Optical Illusionist
   Optical illusions, eye tricks, mind teasers and other puzzles.
   http://www.optical-illusionist.com

Optical Illusions
   Amazing Pictures and Effects
   http://www.panoptikum.net/optischetaeuschungen/opticalillusions.htm

Optical Illusions Etc
   A collection of various forms of optical illusions with explanations, including illusions conveyed through fractals, architecture, art, advertising and real life encounters.
   http://illusionsetc.blogspot.com

Optical Illusions?
   Comments on the terms 'Optical Illusion' and 'Visual Illusion'.
   http://www.anc.ed.ac.uk/~amos/opticalillusion.html

Optical Magic Optical Illusions
   A selection of common images.
   http://www.goodtricks.net/optical-illusions-optical-magic.html

Optical illusion
   A large collection of optical illusions.
   http://www.optical-illusion.org/

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

Planet Perplex
   Selection of optical illusions, hidden images, impossible objects and upside down images.
   http://www.planetperplex.com

Skytopia - Dynamic Optical Illusions
   A selection of old, new and original optical illusions. Many pictures are enhanced via the use of 3D and animation.
   http://www.skytopia.com/project/illusion/illusion.html

Subliminal Messages
   Impossible figures, optical illusions, multimedia and 3D puzzles.
   http://www.subliminalmessages.com/

The McCulloch Effect - An On-line Science Exhibit
   
   http://research.lumeta.com/ches/me/