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We perceive the upper square to be darker and the lower one to be lighter because that's what our brains expect due to the other elements surrounding the grey. If the light is falling from the upper left and the two blocks appear tilted away from us, then we see the upper block as lit and the lower block in shadow, due to the light source coming from the upper left of the image.Ĭombined with the contrasting shading in between the two blocks, our brain interprets the top block as dark and the bottom one as light. Humans perceive the shade of 3D images in a certain way depending on the how the item is lit and the way shadows fall.
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