184. Prato.
CHAPTER XXII.
TRACERY LIGHTS AND ROSE WINDOWS.
Glass in tracery lights and Rose windows cannot consistently be planned on the lines suitable to lancets or other upright shapes; and it is interesting to observe the modifications of design necessitated by its adaptation to circumstances so different. This applies not only to Gothic glass but to Renaissance, the best of which, as it happens, is in Gothic windows. Happily it never occurred to sixteenth century artists to hamper themselves by any affectation of archaism, and their work is deliberately in the new manner. One can understand, too, a certain “up-to-date” contempt on their part for the “old-fashioned” stonework; but it is rather surprising that so few of them seem to have realised how greatly their own work would have gained by a little more consideration of (if not for) the stonework.
Where, as at Gouda, by way of exception, Gothic windows were built to receive later glass, tracery is to all intents and purposes abandoned: the builders would have done away with mullions had they known how otherwise to support such huge glass pictures. It has been explained already, in reference to the influence of the window-shape, and especially of the mullions, upon glass design, how much more formidable these divisions appear upon paper than in the window. That is very plainly seen in many a window where the designer has relied upon them to frame his subjects. The pictures have a way of running together in the most perplexing way, and one has to pick them out for oneself again. The practical conclusion from that is, that the designer is under no obligation to confine himself too strictly within the separate lights of a large window. What he is bound to do is to take care that the mullions never hurt his picture; if they do, it is his picture which is to blame. He may urge with reason that the upright shafts of stone are there merely for the support of the window, and that it is not his business to emphasise them, enough if he acknowledge them. In tracery, however, it is his bounden duty to take much more heed of the stonework. It was designed, in intricate and often very beautiful lines, with deliberately ornamental intent; it was meant to be seen, and it is his function to show it off. The question he has to put to himself is now no longer: does the stonework hurt my design? but: does my design hurt the stonework? And he should not be satisfied unless it helps it. The artist who, at Bourges, having fleur-de-lys-shaped tracery to deal with, carried across it a design quite contrary to the lines of the stonework, was guilty of a blank absurdity.
The Early Rose windows, which were habitually filled with rich coloured glass, consisted either of simple piercings, as at Lincoln, or they were made up of piercings very definitely divided by massive stonework. In proportion as mullions become narrow, and form in themselves a design, it seems doubtful how far deep-coloured glass can do them justice. Only strong tracery lines will stand strong colour. At Châlons-sur-Marne, for example, the foils of certain cusped lights surrounding a central circular picture are successfully ornamented with arabesque of deep yellow upon paler yellow ground; and again at Or San Michele, Florence, certain gorgeous wheels of ruby and yellow, or of blue, green, and yellow, and so on, are unusually satisfactory. In such cases not only breadth of effect but definition of the tracery forms is gained by keeping them (more especially in their outer circumference) much of one tone, whilst contrast of colour between one light and another helps still further to assist definition. But this applies only to stonework strong enough to take care of itself. There is a sort of perverse brutality in putting into delicate and graceful tracery deep rich glass which hides its lines. Such lines want sharply defining against the light.
Early windows had, of course, no tracery properly so called. The great Rose windows, and the smaller Roses surmounting a pair of lancets, were rather piercings than tracery; and it was not difficult to adapt the design of a medallion window to suit them. A small piercing was ready designed for a medallion subject; nothing was wanted but a border round it, narrower, of course, than would have been used for a broad lancet light, but of the same foliated character. The individual quatrefoils or other principal openings, which went to make up a great Rose window, were filled in the same way. If the opening were wedge-shaped, as it often was, the obvious thing to do was to introduce into it a medallion (probably circular) of the full width of the opening, at about its widest, and to fill up the space about it with foliated ornament or geometric mosaic, with which also the smaller and less important piercings would naturally be filled. Sometimes the recurring figure medallions were set alternately in foliated ornament and geometric diaper; or the lights might be grouped in pairs, two with foliage and two with diaper. Similar alternation of the two common kinds of Early filling, naturally occurred in minor openings which contained no medallion. Something of this kind occurs at Reims.