Simultaneous contrast - Definition and More from the Free Merriam-Webster Dictionary
Quote:
Definition of SIMULTANEOUS CONTRAST
: the tendency of a color to induce its opposite in hue, value and intensity upon an adjacent color and be mutually affected in return
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Example: same shade little gray square
Jessica M Choplin Perceptual Comparisons Contrast Effects Ebbinghaus Illusion
In color:
Simultaneous Contrast, Induction
The edge of the box treatment in the original example (not by me) is a new one to me, very interesting application of the concept.