Semantics of Line Drawings
Jocelyn Ireson-Paine
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Some lines represent fuzzy boundaries

We easily understand that the lines rising from the bathtub represent steam, and we would do so even without the colouring. But in reality, steam does not have a definite boundary.

From Wilhelm Busch, Die schönsten Bildergeschichten für die Jugend, this edition 1960, from a late 19th century original.