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Both orange circles are IDENTICAL in size. Drag the right circle to resize it to match the left. The Ebbinghaus illusion shows we judge size relative to nearby objects.
Size Matching
True radius: --
Your radius: --
Error: --
Ebbinghaus Illusion (Titchener Circles)
Surround Size (left)
75
Surround Size (right)
16
Number of Surrounds
6
Surround Distance
110
Shape
Circle
Square
Triangle
Reveal
Animate
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