HackerOptical illusions show how we see | Beau Lotto
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Beau Lotto 用阴影中的色块区分到眼睛的光和观察者想判断的表面反射率。当照明环境改变，进入眼睛的光相同也可能对应不同的反射率。
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Because if the tile in that shadow were in fact in shadow, and reflecting the same amount of light to your eye as the one outside the shadow, it would have to be more reflective -- just the laws of physics.If they're under the same light reflecting the same amount of light to your eye, then they must be equally reflective.