Sketch
English: Sketch is a rapidly executed freehand drawing that is not intended as a finished work, often consisting of a multitude of overlapping lines.
Various sketches
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Drawings of a bird in flight, Leonardo da Vinci.
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Sketches of a lion 1980 pen and china ink on paper by Frans Koppelaar.
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Software generated sketch
Detailed sketch and finished woodcut of Albrecht Dürer's Ritter, Tod und Teufel 1513.