Optical Illusion Book

Do equal lengths and identical colors always look the same?

Optical Illusion Book is an interactive guide to 36 visual illusions. Move lines and shapes, then adjust angle, size, speed, color, spacing, and other conditions to see how perception changes.

ILLUSIONS INCLUDE • Size & Length: Müller-Lyer, Ebbinghaus, Ponzo, and more • Angle & Shape: Zöllner, Café Wall, Fraser Spiral, and more • Color & Brightness: Checker Shadow, Hermann Grid, Cornsweet, and more • Motion & Timing: Apparent Motion, Flash-Lag, Barber Pole, and more • Adaptation & Attention: Motion Aftereffect, Troxler Effect, Afterimage, Peripheral Drift, and more • Figure, Ground & Depth: Rubin's Vase, Necker Cube, Kanizsa Triangle, and more

FEATURES • Interactive demonstrations for all 36 illusions • Depending on the illusion, drag shapes together, switch views, or play and pause animations • Adjust conditions with sliders and observe how the effect changes • Reveal the underlying image and learn why the illusion occurs • Save favorites and filter the catalog • Switch between detailed standard explanations and Easy Language with simpler wording • Furigana in Japanese when Easy Language is enabled • Light and Dark Mode support

Müller-Lyer, Ebbinghaus, and Ponzo are free to use. A one-time Complete Collection purchase unlocks all 36 illusions and every experiment feature. There is no subscription.

Visual effects vary from person to person. Stop using the app if viewing an effect causes discomfort.

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