411 REFERENCE · Wiktionary
Mach band
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
+s
Etymology
Named after the physicist Ernst Mach.
Noun
thumb|196px|right|Animated Mach bands.
Any of a series of bands of slightly different shades of grey that make up an optical illusion where the contrast between the bands appears to be exaggerated as soon as they contact one another.
en eponyms
en Optical illusions