Semantics of Line Drawings
Jocelyn Ireson-Paine
www.j-paine.org/lds/intro.html
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Some lines indicate surface orientation

Notice the horizontal lines on the back of the leftmost animal, and the vertical ones on the nose of the rightmost. We are expected to realise that these do not indicate scars or other marks, they just tell us about the curvature of these surfaces.


From Lupo Alberto Collezione N. 7, 1993.