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| There is no way to properly categorize illusions, as in many cases there are several underlying mechanisms contributing to an effect. In addition, not all illusions are completely understood. Therefore, the following illusion demonstrations will be presented in old-fashioned categories (even though these categories are completely misleading). Many of the interactive demonstrations requirejavaandshockwaveplugins. | |||||||||||||||
| Impossible Figures and Objects. These charming impossible figures are spatially inconsistent and paradoxical, yet they can reveal important insights into how we interpret three-dimensional objects from two-dimensional images. | |||||||||||||||
| Ambiguous
Illusions. In some cases the constraints for interpreting
a scene or motion are ambiguous. Your visual system can interpret the scene
in more than one way. Even though the image on your retina remains constant,
you never see an odd mixture of the two perceptions-- it is always one
or the other, although they may perceptually flip back and forth.
Ambiguous Images Figure/Ground Ambiguity Perceptual Ambiguity Motion Ambiguity Cast Shadow and Ball Barber Pole Illusion Breathing Square Ouchi Illusion Distortion Illusions. Illusions that distort an image's size, shape, and length. Size Constancy Illusions Poggendorf Illusion Twisted Cord Illusion Cafe Wall Illusion Fraser Spiral Muller-Lyer Illusion Camouflage Illusions. We hope you can find these interactive demonstrations! What determines a figure from its ground? Funny Places. Tourist traps and extraordinary rooms! Balls and water flow mysteriously uphill and people grow and shrink right before your eyes. Ames Room Anti-Gravity Houses and Hills Stereo Illusions. The amazing world of 3-D. Afterimages, Motion Aftereffects, Lateral inhibition. Mostly low level effects cause these effects. Images and colors that arenít really there. Spots before your eyes, and motion where there is no motion. Black and white afterimage Color afterimage Motion Aftereffect Hermann Grid Scintillating
Grid Filling-in Illusion
Color and Shadow Illusions. Amazing illusions of color and shadow. Shadow
illusion Adelson brightness
illusions Shape from Shading
Facial Illusions. Illusions of expression. Margret
Thatcher Illusion Presidential
Illusion.
Auditory Illusion. The famous illusion of circular pitch. The ascending scale seems to rise forever, but somehow keeping cycling like an M. C. Escher staircase. Shockwaverequired. Auditory
illusion Cross-Modal Interaction
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