Elusive Arch

2005 Third prize
Dejan Todorović

University of Belgrade, Serbia

Shading is a powerful way to represent the relief of 3-dimensional objects in pictures. However, the way our vision interprets shaded images depends on the shape of their contours. Here two different contours of the same shading pattern convey two different reliefs, joined into an impossible object.

Read more about the illusion and possible explanations

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