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Mach bands

For the shock-wave pattern, see Mach diamond.
Exaggerated contrast between edges of the slightly differing shades of gray appears as soon as they touch
Along the boundary between adjacent shades of grey in the Mach bands illusion, lateral inhibition makes the darker area falsely appear even darker and the lighter area falsely appear even lighter.

Mach bands is an optical illusion named after the physicist Ernst Mach. It exaggerates the contrast between edges of the slightly differing shades of gray, as soon as they contact one another, by triggering edge-detection in the human visual system. The Mach band illusion is sometimes called the Chevreul illusion.[1]

  1. ^ Geier, János; Hudák, Mariann (2011-10-13). "Changing the Chevreul Illusion by a Background Luminance Ramp: Lateral Inhibition Fails at Its Traditional Stronghold - A Psychophysical Refutation". PLoS One. 6 (10): e26062. doi:10.1371/journal.pone.0026062. ISSN 1932-6203. PMC 3192777. PMID 22022508.
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