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> Anatomic phenomena
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Contrasts

Mach bands
Our vision amplifies the effect of contrast at the borders of coloured areas. Discover what this means! > more
Irradiation
Why do white squares on a black background appear larger than black squares of the same size on a white background? > more
Kanizsa's triangle
The human eye can link up parts of a shape to form a complete image. Discover how this works. > more
Transparency
Colour areas of exactly the same shade appear to have a different brightness. How does this effect arise? > more