12 fascinating optical illusions show how color can trick the eye

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“Changing a color’s appearance by changing the background or lighting is one of the most common techniques in optical illusions. As the examples below show, colors can change dramatically against different backgrounds. (If you’ve ever held a sock up to something black to see whether it was black or navy, you understand the concept.)”

http://www.washingtonpost.com/blogs/wonkblog/wp/2015/02/27/12-fascinating-optical-illusions-show-how-color-can-trick-the-eye/?tid=pm_business_pop

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