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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.