"Counter-Rotating Spirals Illusion"
Specialized in creating optical-illusions
"Exploratorium Learning Studio On-Line Exhibits"
Illusions teaching concepts of color and vision
Vision therapy software developed by optometrists to fight against unpleasant symtoms
Optical illusions, scientific toys, visual effects, and even a little magic
Exampples and explanation of pictographic, stereographic, and 3D distortion, as well as color/contrast effects
"Illusions Central Station"
From a temporary exhibit at Heureka
"Intelligent Imaging Innovations, Inc."
Makers of digital confocal microscopy workstations and SlideBook 2D/3D image processing and microscope control software for MacOS and Windows '95
Magical illusions in art, literature, music, mathematics, social science, and virtual reality
"Joy of Visual Perception: A Web Book"
Specialized in optical illusions
Specializing in multispectral and hyperspectral imaging systems/software for airborne remote sensing, and parallel non-invasive systems for biomedicine
"M.C. Escher & Optical Illusions"
Collection of images by M.C. Escher, as well as other optical illusions and tesselations
A gallery of various illusions
"Perception, Illusions, and Their Neuronal Correlates"
HUNDREDS OF ILLUSIONS! Our Illusion Site is growing fast and has quickly become the largest collection of illusions on the internet
An online collection of colorful optical illusions without a lot of 'deep' science. Includes many interactive demonstrations, science projects, art, books, games, puzzles and more
"Scitec Instruments Ltd"
Design and manufacture optical choppers and lock-in amplifiers
"University of Illinois - Photonic System Group"
Studies the ultrafast dynamics of optical fields and of field matter interactions
"World of Escher"
Famous Dutch graphic artists: geometric tilings, spatial illusions, essays and stories
Engineers and designs custom lens, instruments, and optical systems