Walker, William, b. 1821 · New York : C. Scribner · leaf 256
ing lines slanting upwards,thus indicating that they are below the eye, as in Fig. 179,the spectator has what is known as a birds-eye yiew. 327. Hitherto we haye concerned ourselyes only withreceding lines which were parallel to the ground plane,and at right angles to the plane of the spectator.… … Fig. 179.
Drawing -- Study and teaching
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