Ambient occlusion

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Ambient occlusion is a technique used in 3D computer graphics. The physics of how photons of light can occupy a space means that inner corners of objects (or seams where 2 objects meet) appear darker to the eye. Because less light can occupy a corner. Even when the corners are the same colour.

Imagine being inside a matte white cube with even light ; the surface colour is exactly the same so theoretically you shouldn't be able to see any corners or edges; but because of the described effect you can.