is an visual phenomena during which there is a visible contrast produced by two or more adjacent rectangular grey images which differ in lightness.

MACH BANDS: "Mach bands are one of the many visual phenomena which occur when two grey images are placed adjacent to each other differing only in lightness."
Cite this page: N., Pam M.S., "MACH BANDS," in, April 7, 2013, (accessed May 16, 2021).