Believe it or not, these two skulls are the exact same color! It's called the "Munker-White" illusion. The effect happens because the skull on the left has blue stripes in the foreground with yellow in the background, while the skull on the right has it the other way around. Don't believe me? Look at the 2nd image further down the page. That's the exact same graphic after the stripes are removed. Crazy right?
Jacob Teitelbaum, M.D. is one of the world's leading integrative medical authorities on fibromyalgia and chronic fatigue. He is the lead author of four research studies on their treatments, and has published numerous health & wellness books, including the bestseller on fibromyalgia From Fatigued to Fantastic! and The Fatigue and Fibromyalgia Solution. Dr. Teitelbaum is one of the most frequently quoted fibromyalgia experts in the world and appears often as a guest on news and talk shows nationwide including Good Morning America, The Dr. Oz Show, Oprah & Friends, CNN, and Fox News Health.