1 Also known as top-lighting preference and lit-from-above assumption.
2 See “Perception of Shape from Shading,” Nature, 1988, vol. 331, p. 163–166; and “Perceiving Shape from Shading,” Scientific American, vol. 256, p. 76–83, both by Vilayanur S. Ramachandran.
3 “Where Is the Sun?” by Jennifer Sun and Pietro Perona, Nature Neuroscience, 1998, vol. 1(3), p. 183–184.
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