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 A square pulsates when its rotation is concealed.
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 Actually discovered on a café wall, a large array of these black and white bricks can be quite disorienting.
Hollow
Thick Mortar
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 Another effect similar to Café Wall.
Second Version
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 Lines tend to sink towards the circles.
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 A simple distortion of a figure by background objects.
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 The Changizi and Shimojo lab's proposed Uber Applet for most geometrical distortions based on a background figure.
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 One classic demonstration of the relativity of size.
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 An artistic combination of Muller-Lyer and Ponzo for a strong distortion in apparent length.
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 A classic tilt effect adapted from Fraser's original "LIFE."
First Version
Spiral
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 Local orientation cues outweigh global alignment.
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 This ellipse can either rotate or undulate.
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 Two sets of random dots, superimposed and translated, display patterns and other edge effects.
Bitmap
Color Bitmap
Gaussian Noise
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 Lines bulge on top of a star.
Moire
Rectangle
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 Figures camouflaged with the background, visible only while in motion.
Isoluminance
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 Apparent change in size depending on location.
Stacked
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 Illusory figures.
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 A step above the Café Wall in artistry and dizziness.
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 Convergent lines appear parallel while rotating.
St. George's Cross
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 Circles appear from an array of dots.
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 Overlaying patterns give rise to unexpected figures and edge effects.
Circles
Circle with Fresnel Plate
Fresnel Zone Plates
Gradients
Grid
Log Spirals
Stars
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 The quintessential optical illusion. Which line is longer?
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 Figure distortion with a square and a MacKay star.
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 Connect-the-dots just got that much harder.
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 Form from motion of random dots.
Dynamic Noise
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 Figures which bend and undulate as they rotate slowly.
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 A demonstration that perspective actually changes the shapes we see.
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 A simple figure which tends to twinkle.
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 Zigzagging lines cause flickering intensity, after Reginald Neal.
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 A Fraser-like effect.
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 The orientation of a line can change its apparent length.
Bisection
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 Another Fraser-like effect, combining the illusions of Fraser's Spiral and Twisted Cord.
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 More deformations based on background objects.
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