The occlusions between the parts of the body are represented realistically in the portrait of the “two Martians” of Sivré III (paintings likely older than the fourth millennium BC), two women or a man (left) and a woman (right), depicted in complicated postures, without resorting to the twisted perspective so commonly used in late pastoral art of the Ennedi. Edge detection dominated the visual experience of the artists who painted in the Sivré style, of which the “two Martians are one of the most famous examples. The compiled 3D model demonstrates that the design of the two “Martians” comes from the memory of a real 3D visual experience, reproduced according to a single point of view. Reference: Idiosyncratic paintings from a distant past in Sivré I (Ennedi, Chad).
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