1983 volume 12(1) pages 85 – 86
doi:10.1068/p120085

Cite as:
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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