Adelson's Checker-Shadow Illusion
Would you believe that squares A and B in the above image are the exact same color? As incredible as it may seem, they are identical. Below is the same image with everything but those squares removed. Now it's apparent that they are the exact same color.
What's going on? Your brain sees that the green cylinder is casting a shadow over square B, and it knows that a shadow makes an object appear darker than it really is. So it interprets square B to be a lighter color than it sees. But the graphic is cleverly designed so that the shadow does not actually overlay square B. So your brain shouldn't make this internal color adjustment. And even though this is now explained to you, you simple can't force your mind to not do the adjustment. It's your brain's story, and it's sticking to it :-)
This famous illusion was created in 1995 by Edward H. Adelson, a professor of vision science at MIT.
Jacob Teitelbaum, M.D. is one of the most frequently quoted post viral CFS, fibromyalgia, energy, sleep and pain medical authorities in the world. He is the author of 12 books including You Can Heal from Long Covid, the best-selling From Fatigued to Fantastic!, Pain Free 1-2-3, The Complete Guide to Beating Sugar Addiction, Real Cause Real Cure, The Fatigue and Fibromyalgia Solution, and the popular free Smart Phone app Cures A-Z. He is the lead author of eight research studies and three medical textbook chapters on effective treatment for fibromyalgia and chronic fatigue syndrome. Dr. Teitelbaum appears often as a guest on news and talk shows nationwide, including past appearances on Good Morning America, The Dr. Oz Show, Oprah & Friends, CNN, and FoxNewsHealth.
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