Ad: Bezold Effect (Optical Illusion) Postcard
When you take a look at the picture are some of the red lines darker than others? Showcase the Bezhold effect with any of these optical illusion gifts. Explanation caption says the following: "Notice that the red seems lighter when combined with white & that the red appears darker when combined with black. This optical illusion is named after Wilhelm von Bezhold (1837 - 1907) who discovered that a color may appear different depending upon its relation to adjacent colors." Educational visual fun psyche / psychology attitude for those who understand that color is relative! myOpticalIllusion
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