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  Adelson's Illusion

  Believe it or not, the two squares labeled A and B are the same shade.

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  Alternative Motion Illusion

  Are the dots moving vertically? or horizontally? or are they spinning?

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  Appearing Dots Illusion

  Focus on the white dots and the adjacent dots will appear to turn black.

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  Asahi Illusion of Brightness

  The center of this flower appears brighter than it actually is.

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  Breathing Square

  The square appears to expand and contract, creating a breathing effect.

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  Cafe Wall

  All the lines in the demo are perfectly horizontal, but they appear slanted.

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  Color Fan

  Focus on the black dot, the illustration may appear to develop a darker border.

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  Color Spheres

  All the spheres are gray, but they appear red, green, and blue.

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  Colors from Contour

  Some lines appear blue, some others appear red... but they are all black.

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  Contrast Asynchrony

  These dots always have the same color... or do they?

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  Cornsweet Illusion

  The left and right ends are the same shade of gray until a gradient happens.

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  Curvature Blindness Illusion

  Top lines look straighter while bottom lines look more curved, but both are equally wavy.

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  Disappearing Dots Illusion

  Focus on one black dot and watch the others disappear.

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  Dotted Line Motion

  Follow the dot around, and the dotted lines will appear to move.

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  Dotted Lines Sway

  The central area appears to slide and sway, even though it is completely static.

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  Ebbinghaus Illusion

  Which orange circle is larger: the one on the right or the one on the left?

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  Ebbinghaus Illusion (II)

  Which orange circle is larger: the one on the right or the one on the left?

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  Ebbinghaus Illusion (III)

  Which orange circle is larger? This time animated.

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  Ehrenstein's Illusion

  Which orange circle is larger? This time animated.

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  Enigma

  Focus on the pink circle, the rings appear to spin or scintillate.

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  Expanding Hole

  This static illusion looks like a black hole expanding at the center.

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  Hering Illusion

  Straight lines appear to bow outwards due to the background pattern.

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  Induced Gradients

  All three color bars are the same colors, but they all look different.

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  Induced Gradients (II)

  The central bar is a flat color over a repeating pattern.

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  Kanizsa Square

  Do you see a white square over 4 circles? Or 4 Pac-Man shapes?

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  Mainz-Linez Illusion

  This red dot appears to move in zigzag due to the background pattern.

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  Motion Binding Illusion

  Are these two sets of lines operating independently or a single shape?

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  Motion Inversion Illusion

  The animated band moves to right or left depending on your focus.

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  Müller-Lyer Illusion

  Different arrowheads make the lines appear different in length.

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  Münsterberg Poggendorff Illusion

  The two sides of an arch appear misaligned, but they do meet at the top.

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  Neon Color Spreading

  There's no green circle... kind of...

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  Ouchi Illusion

  The pattern inside the circle gives the impression of moving sideways.

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  Palisade Illusion

  The wheel radii bend when viewed through a palisade.

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  Parallel Lines (I)

  The black lines are parallel, but they appear not to be because of the bars crossing them.

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  Parallel Lines (II)

  The black lines are parallel, but they appear not to be because of the bars crossing them.

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  Penrose Triangle

  This optical illusion depicts an impossible shape.

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  Pinna-Brelstaff Illusion

  The center of this illustration will move when you look at the moving dot.

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  Poggendorff Illusion (I)

  The lines seem misaligned... but are they?

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  Poggendorff Illusion (II)

  These parallel lines seem misaligned... but are they?

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  Ponzo Illusion

  The color lines are the same size, but appear different due to perspective.

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  Psychokinematic Tower

  This illusion looks like a three-dimensional tower spinning in space.

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  Reverse Spoke Illusion

  The spokes appear to rotate in the opposite direction of the background.

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  Rotating Snakes

  The discs in this illusion spin without moving.

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  T Illusion

  Both the vertical and horizontal lines are the same length, but the vertical line appears longer.

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  Tilted Table

  Both blocks are parallel, but the top one looks tilted to the left.

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  Troxler Fading

  Stationary dots fade away when you stare at a fixed point.

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  Troxler Fading (II)

  Stationary dots fade away when you stare at a fixed point.

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  Waddling Colors (I)

  The color boxes seem to step around or waddle.

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  Waddling Colors (II)

  The color boxes seem to step around or waddle.

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  Waves

  The circles appear to move in waves but they are static.

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  Wertheimer-Koffka Ring

  The ring color is uniform, but a side looks darker depending on background.

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  White's Illusion

  The same gray columns look different depending on the surrounding color.

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  White's Illusion (II)

  The two squares are the same color but one appears lighter than the other.

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  Wundt Illusion

  Red lines appear curved but are actually straight.