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.