![]() “Rotating Snakes” – with luminance control.Snake ad lib – optimising this motion illusion.»Rotating Snakes« Illusion – with a new explanatory twist.Reverse Phi Motion – something for the specialist.Motion Aftereffect – also known as »waterfall effect«.Book (in German): “… Täuschungen … Sehphänomene” More materialīach & Poloschek (2006) Optical Illusions Primer (PDF, 2 pages from ACNR) on the programming: Bach 2014 (paywalled, contact me for a PDF). For many illusions, there is a percentage of people with perfectly normal vision who don’t see them, mostly for reasons currently unknown. There is some influence of age, though – but you don’t need illusions to know your age… So: Don’t let it irk you if you don’t see all the phenomena described. However, there is no reliable scientific data that suggests this. ![]() extroverted, stressed or sublime, or whatnot…) can be deduced from your ability to see some given illusion. The web is full of claims that your personality (right- or left brain dominated, intro- vs. ![]() Do illusions reveal something about my personality? ![]() So, if an explanation seems gibberish, simply enjoy the phenomenon □. That is not on purpose, but vision research simply is not trivial, like any science. If you are not a vision scientist, you might find my explanations too highbrow. These experiences are based on normal visual conditions, and thus under unusual contexts can lead to inappropriate interpretations of a visual scene (=“Bayesian interpretation of perception”). Rather, I view these phenomena as highlighting particular good adaptations of our visual system to its experience with standard viewing situations, confronted with an atypical situation. »Optical illusion« sounds derogative, as if exposing a malfunction of the visual system. Returning visitor? Check →here for History/News My selection here emphazises beauty and interactive experiments I also attempt explanations of the underlying visual mechanisms where possible. They also teach us about our visual perception and its limitations. Optical illusions don’t “trick the eye”, nor “fool the brain”, nor reveal that “our brain sucks”, … but are fascinating! contrast (del.) Crossmodal 2003-02.12 no sex… Stereokinetics Neon -04 interactive M-W Café Wall sigma motion equiluminance Müller-Lyer animated Fraser White's illusion Adelson’s plaid Spoke rotation Hollow face First installment Binding Ames Window Moiré Patterns snake ad lib Mach Bands Saccadic Suppression Contour Adaptation Colour Wagon Wheel Tilt Delboeuf Jastrow New Stepping Feet improved SAM improved Café Wall Leaning Towers Spine Drift New technology to replace Flash Motion silencing Tilted Table Impossible waterfall Munker Illusion Improved snak Numerosity Anamorphosis Shaded diamonds Checker Bulge -08 Breathing Square Colour mixing Darwin Illusion Ternus Necker cube symmetric silhouette reverspectives Triangle Puzzle Snake ad lib Ambiguous Silhouette Ghostly Gaze Hallucii Wagon-wheel Sine Illusion Helm's Kaleidoscope Roget's Palisade Spiral motion aftereffect floating Frankfurter Lazy Shadow Hidden Bird Gestalt & colour Freezing Rotation Hyperacuity cube illusion Angry & Smile Section Breaks Motion Binding Vasarely’s pyramid Terror Subterra eye jitter liac chaser Shepard’s table switched to CSS twisted Hermann grid frequency doubling Lincoln Luminance looming Missing fundamental Dalmatian T-illusion COBC impossible face on Mars face-in-beans checker shadow feet-lin Pinna-Brelstaff contrast gain Flash-Lag strobo artifacts rotating snake reverse phi text Poggendorff dynam. Color from contour Pop-out improved Snake brightness probed shape from shading Chromostereopsis Missing fundamental Oblique adjustable Color Change illusion improved Palisade Grid masking Curving Scintillating Grid Rebuilt entire site in “Jekyll” This site uses no more Flash Colour Assimilaton New Numerosity New Bulge Site now in HTTPS New Jastrow 3D silouette Contour & colour Update equilu Oblique Grating Red (?) strawberries White (?) Xmas 12 black dots Snakes & luminace cntrl Acoustic Shepard Cube Corner Church or chicken Disjointed Arch Brick wall illusion New reverse phi New motion bounce New hidden messages Flash ≤ 10% Pulfrich Effect McCollough Effect New dynamic contrast Rotatory Moirée Colored-dress enigma Dotted Motion Illusion Psychokinematics Thatcher/Merkel Equiluminance Scanimation Watercolor Pinna-Brelstaff 2 Pigeon Neck Hidden bird New Enigma New Induced Grating New COBC Colour Matching Game Colour Phi Dynamic Ebbinghaus Colour contrast Benham unrolled New Flash Lag Wagon-wheel/JavaScript Spokes in JavaScript Ebbinghaus Spiral MAE in JavaScript “Palisade” in JavaScript Tusi Motion Colour Fan new Pinna-Brelstaff Blind Spot improved M. Simplest oblique Diamonds/squares Relative motion Size Constancy curved lines Ehrenstein disks Bourdon revamped Roget wireframe / silhouette revamped contrast ad.
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