Howard I P, 1983, "Occluding edges in apparent reversal of convexity and concavity" Perception 12(1) 85 – 86
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Occluding edges in apparent reversal of convexity and concavity
Ian P Howard
Received 8 April 1982
Abstract. Certain undulating surfaces have an ambiguous relief which may appear as convex or concave. The direction of relief is generally held to depend primarily on assumptions about the direction of illumination. It is suggested that this does not apply to pictures with relief features with occluding edges.
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