A Treatise on Painting, by Leonardo da Vinci
1721
Senex and Taylor, London
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Never draw the Contours of your Figures in any Colour different from that of the Ground they are in; that is, never make any obscure *Profiles between the Figures and the Ground.
* Profile, is that which marks out the Parts, Members, and Jettings out &c: of solid Bodies, and is opposed to the Plan; as when we say the Profile of a Church, we mean the Representation of its Height, Depth, and Length, &c. In Sculprure it signifies a Head drawn sideways, as in Medals, &c.