You cannot anywhere find a more lovely piece of fancy, or more illustrative of the quantity of result, than may be obtained with low and simple chiseling. The figures are all perfectly simple in drapery, the story told by lines of action only in the main group, no accessories being admitted. There is no undercutting anywhere, nor exhibition of technical skill, but the fondest and tenderest appliance of it; and one of the principal charms of the whole is the adaptation of every subject to its quaint limit. The tale must be told within the four petals of the quatrefoil, and the wildest and playfulest beasts must never come out of their narrow corners. The attention with which spaces of this kind are filled by the Gothic designers is not merely a beautiful compliance with architectural requirements, but a definite assertion of their delight in the restraint of law; for, in illuminating books, although, if they chose it, they might have designed floral ornaments, as we now usually do, rambling loosely over the leaves, and although, in later works, such license is often taken by them, in all books of the fine time the wandering tendrils are inclosed by limits approximately rectilinear, and in gracefulest branching often detach themselves from the right line only by curvature of extreme severity.
174. Since the darkness and extent of shadow by which the sculpture is relieved necessarily vary with the depth of the recess, there arise a series of problems, in deciding which the wholesome desire for emphasis by means of shadow is too often exaggerated by the ambition of the sculptor to show his skill in undercutting. The extreme of vulgarity is usually reached when the entire bas-relief is cut hollow underneath, as in much Indian and Chinese work, so as to relieve its forms against an absolute darkness; but no formal law can ever be given; for exactly the same thing may be beautifully done for a wise purpose, by one person, which is basely done, and to no purpose, or to a bad one, by another. Thus, the desire for emphasis itself may be the craving of a deadened imagination, or the passion of a vigorous one; and relief against shadow may be sought by one man only for sensation, and by another for intelligibility. John of Pisa undercuts fiercely, in order to bring out the vigor of life which no level contour could render; the Lombardi of Venice undercut delicately, in order to obtain beautiful lines and edges of faultless precision; but the base Indian craftsmen undercut only that people may wonder how the chiseling was done through the holes, or that they may see every monster white against black.
175. Yet, here again we are met by another necessity for discrimination. There may be a true delight in the inlaying of white on dark, as there is a true delight in vigorous rounding. Nevertheless, the general law is always, that, the lighter the incisions, and the broader the surface, the grander, cæteris paribus, will be the work. Of the structural terms of that work you now know enough to understand that the schools of good sculpture, considered in relation to projection, divide themselves into four entirely distinct groups:—
1st. Flat Relief, in which the surface is, in many places, absolutely flat; and the expression depends greatly on the lines of its outer contour, and on fine incisions within them.
2d. Round Relief, in which, as in the best coins, the sculptured mass projects so as to be capable of complete modulation into form, but is not anywhere undercut. The formation of a coin by the blow of a die necessitates, of course, the severest obedience to this law.
3d. Edged Relief. Undercutting admitted, so as to throw out the forms against a background of shadow.
4th. Full Relief. The statue completely solid in form, and unreduced in retreating depth of it, yet connected locally with some definite part of the building, so as to be still dependent on the shadow of its background and direction of protective line.
176. Let me recommend you at once to take what pains may be needful to enable you to distinguish these four kinds of sculpture, for the distinctions between them are not founded on mere differences in gradation of depth. They are truly four species, or orders, of sculpture, separated from each other by determined characters. I have used, you may have noted, hitherto in my Lectures, the word 'bas-relief' almost indiscriminately for all, because the degree of lowness or highness of relief is not the question, but the method of relief. Observe again, therefore—
XII.
BRANCH OF PHILLYREA.