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.

Eyetricks.com
Optical illusions, 3D stereograms and anaglyphs, fractals and brain teasers

IllusionWorks
A multimedia museum of optical and sensory illusions, with online demonstrations and explanations.

Eye Magic: Optical Illusions
Offers a number of optical illusions for viewing, as well as explanations on how they work.

Opticalillusions.ws
Many optical illusions, optic tricks and brain teasers.

Skytopia - Dynamic Optical Illusions
A selection of old, new and original optical illusions. Many pictures are enhanced via the use of 3D and animation.

Optical Illusions for Kids
Offers a collection of illusions, brain teasers, and puzzles for children.

Just Optical Illusions
Focus on geometric optical illusions by Gianni A. Sarcone and Marie J. Waeber

Mindfake.com
Site contains a collection of optical illusions, online games, and other fun things.

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.

Mentalillusion.com
Various illusion resources, including some illusion puzzles.

Akiyoshi's illusion pages
Many works of Akiyoshi Kitaoka. Designs around standard illusions crafted to maximise the illusory effect.

Fun puzzles
A selection of standard optical illusions along with some online puzzles and games.

All Optical Illusions
Gallery of optical illusions, 3d art, puzzles, and visual gags.

Brainteasers
Brainteasers, riddles, paradoxes, optical illusions etc.

Optical Illusions?
Comments on the terms 'Optical Illusion' and 'Visual Illusion'.

Cool Optical Illusions
A growing collection of optical illusions and eye tricks, including original illusion pictures and a collection of optical illusion desktop wallpaper.

Mchael Bach: Optical Illusions & Visual Phenomena
The stress here is on relative novelty and interactivity, in combination with a scientific background. Regularly updated.

Optical Magic Optical Illusions
A selection of common images.

Optillusions
A collection of riddles and optical illusions of many different forms with thumbnail browsing.

Optical Illusion Archive
A collection of optical illusion images, 3D street art, and flash demonstrations.

Planet Perplex
Selection of optical illusions, hidden images, impossible objects and upside down images.

Amazing Eyetricks
Gallery of pictures that will trick your eyes.