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Mchael Bach: Optical Illusions & Visual Phenomena - The stress here is on relative novelty and interactivity, in combination with a scientific background. Regularly updated.
NIEHS Kids Page -- Optical Illusions - Presented by the National Institute of Environmental Health Sciences. A collection of illusions.
National Optical Astronomy Observatory - Information, news, resources, outreach programs, gallery, observing information, software, and newsletter and reports.
Optical Illusion Archive - A collection of optical illusion images, 3D street art, and flash demonstrations.
Optical Illusionist - Optical illusions, eye tricks, mind teasers and other puzzles.
Optical Illusions - Amazing Pictures and Effects
Optical Illusions Etc - Contains many optical illusions in blog format.
Optical Illusions? - Comments on the terms 'Optical Illusion' and 'Visual Illusion'.
Optical Instruments (Balham) Ltd. - Servicing & repair of optical assemblies including camera, binocular and telescope lenses. UK.
Optical Magic Optical Illusions - A selection of common images.