[51] That is to say, local color inherent in the object. The gradations of color in the various shadows belonging to various lights exhibit form, and therefore no one but a colorist can ever draw forms perfectly (see Modern Painters, vol. iv. chap. iii. at the end); but all notions of explaining form by superimposed color, as in architectural moldings, are absurd. Color adorns form, but does not interpret it. An apple is prettier because it is striped, but it does not look a bit rounder; and a cheek is prettier because it is flushed, but you would see the form of the cheek bone better if it were not. Color may, indeed, detach one shape from another, as in grounding a bas-relief, but it always diminishes the appearance of projection, and whether you put blue, purple, red, yellow, or green, for your ground, the bas-relief will be just as clearly or just as imperfectly relieved, as long as the colors are of equal depth. The blue ground will not retire the hundredth part of an inch more than the red one.
[52] See, however, at the close of this letter, the notice of one more point connected with the management of color, under the head "Law of Harmony."
[53] See farther, on this subject, Modern Painters, vol. iv. chap. viii. § 6.
[54] See [Note 7] in Appendix I.
[55] "In general, throughout Nature, reflection and repetition are peaceful things, associated with the idea of quiet succession in events; that one day should be like another day, or one history the repetition of another history, being more or less results of quietness, while dissimilarity and non-succession are results of interference and disquietude. Thus, though an echo actually increases the quantity of sound heard, its repetition of the note or syllable gives an idea of calmness attainable in no other way; hence also the feeling of calm given to a landscape by the voice of a cuckoo."
[56] This is obscure in the rude wood-cut, the masts being so delicate that they are confused among the lines of reflection. In the original they have orange light upon them, relieved against purple behind.
[57] The cost of art in getting a bridge level is always lost, for you must get up to the height of the central arch at any rate, and you only can make the whole bridge level by putting the hill farther back, and pretending to have got rid of it when you have not, but have only wasted money in building an unnecessary embankment. Of course, the bridge should not be difficultly or dangerously steep, but the necessary slope, whatever it may be, should be in the bridge itself, as far as the bridge can take it, and not pushed aside into the approach, as in our Waterloo road; the only rational excuse for doing which is that when the slope must be long it is inconvenient to put on a drag at the top of the bridge, and that any restiveness of the horse is more dangerous on the bridge than on the embankment. To this I answer: first, it is not more dangerous in reality, though it looks so, for the bridge is always guarded by an effective parapet, but the embankment is sure to have no parapet, or only a useless rail; and secondly, that it is better to have the slope on the bridge and make the roadway wide in proportion, so as to be quite safe, because a little waste of space on the river is no loss, but your wide embankment at the side loses good ground; and so my picturesque bridges are right as well as beautiful, and I hope to see them built again some day instead of the frightful straight-backed things which we fancy are fine, and accept from the pontifical rigidities of the engineering mind.
[58] I cannot waste space here by reprinting what I have said in other books; but the reader ought, if possible, to refer to the notices of this part of our subject in Modern Painters, vol. iv. chap xvii.; and Stones of Venice, vol. iii. chap. i. § 8.
[59] If you happen to be reading at this part of the book, without having gone through any previous practice, turn back to the sketch of the ramification of stone pine, [Fig. 4], [p. 17], and examine the curves of its boughs one by one, trying them by the conditions here stated under the heads A and B.
[60] The reader, I hope, observes always that every line in these figures is itself one of varying curvature, and cannot be drawn by compasses.