... is about 4000 feet; and although, as before noticed, the first slope from the top towards the right is merely a perspective line, the part of the contour c d, Fig. 33, p. 181, which literally overhangs,[82] cannot be. An apparent slope, however steep, so that it does not overpass the vertical, may be a horizontal line; but the moment it can be shown literally to overhang, it must be one of two things,—either an actually pendant face of rock, as at a, Fig. 77, or the under edge of an overhanging cornice of rock, b. Of course the ... — Modern Painters, Volume IV (of V) • John Ruskin
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