A treatise on painting : in four parts : consisting of an essay on the education of the eye with reference to painting, and practical hints on composition, chiaroscuro, and colour : the whole illustrated by examples from the Italian, Venetian, Flemish, and Dutch schools (1880)
Burnet, John, 1784-1868 · London : Henry Sothern & Co. · leaf 35
17 EDUCATION OP THE EYE. the curve on which the mouth is placed, as in Fig. 20, we can easily perceive that a person viewing it in the direction of the lines a b, which … would give him a view of the face between a front and profile (or what is termed by artists a three quarter), would see one side of the lip of its entire length, while the other side, lying in the direction of the visual rays, would be reduced to a very small space, as may be perceived by its…
Painting
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
