Читать книгу Windows: A Book About Stained & Painted Glass - Lewis F. Day - Страница 9

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The art of the glass painter was at first only the art of the glazier. To say that may seem like self-contradiction. But it is not so. On the contrary, it is almost literally the truth; and it is difficult to find words which would more vividly express the actual fact.

We are accustomed to think of a painter as using pigment always in some liquid form, and applying it to wood or plaster, canvas or paper, with a brush. Should he lay it on with a palette knife, as he sometimes does, it is painting still. If he could by any possibility put together his colours in mid-air without the aid of paper, canvas, or other solid substance, it would still be painting. This is very much what the worker in stained glass, by the help of strips of intervening lead, practically succeeded in doing.

As a painter places side by side dabs of paint, so the glazier put side by side little pieces of coloured glass. (Glass, you see, was the medium in which his colour was fixed, just as oil, varnish, wax, or gum is the vehicle in which the painter’s pigment is ordinarily held in suspension.) He could execute in this way upon the bench or the sloped easel quite an elaborate pattern in coloured glass; and although, in order to hold the parts together in a window frame, he had perforce to resort to some sort of binding, in lead or what not, he may still reasonably be said, if not actually to have painted in glass, at all events to have worked in it. In fact, until about the twelfth century, there were no glass painters, but only glaziers. Nay, more, it is to glaziers that we owe the glory of the thirteenth century windows, in which, be it remembered, each separate touch of colour is represented by a separate piece of glass, and each separate piece of glass is bounded by a framework of lead connecting it with the neighbouring pieces, whilst the detail added by the painter goes for not very much.

4. Arab Window Lattice, Geometric.

No strictly defined, nor indeed any approximate, date can safely be given at which the art of the glass-worker sprang into existence. Arts do not spring into existence; they grow, developing themselves in most cases very slowly. The art of working in stained glass can only have been the result of a species of evolution. The germ of it lay in the circumstance that glass was originally made in comparatively small pieces (there were no large sheets of glass a thousand years or more ago), and so it was necessary, in order to glaze any but the smallest window opening, that these small pieces should be in some way cemented together. It followed naturally, in days when art was a matter of every-day concern, the common flower of wayside craftsmanship, that the idea of putting these pieces together in more or less ornamental fashion, should occur to the workman, since they must be put together somehow; and so, almost as a matter of course, would be developed the mosaic of transparent glass, which was undoubtedly the form stained glass windows first took.

It has been suggested that in some of the earliest windows the glazing is meant to take the form of tesseræ; but the examples instanced in support of that idea afford very little ground for supposing any such intention on the part of the first glass-workers. It may more reasonably be presumed that any resemblance there may be between early glass and earlier wall mosaic comes of working in the same way; like methods inevitably lead to like results.

It is by no means certain, even, that the first glaziers were directly inspired by mosaic, whether of marble or of opaque glass. They were probably much more immediately influenced by the work of the enameller.

5. Arab Lattice, Geometric.

That may appear at the first mention strange, considering what has been said about the absolute divergence between mosaic and enamelled glass. But it must be remembered that enamelling itself among the Lombard Franks, the Merovingians, and the Anglo-Saxons, was a very different thing from what the Limousin made it in the sixteenth century. It was, in fact, a quite different operation, the only point in common between the two being that they were executed in vitreous colour upon a metal ground. The enamel referred to as having probably influenced the early glazier is of the severer kinds familiar in Byzantine work, and known as champlevé and cloisonné. In the one, you know, the design is scooped out of the metal ground, in the other its outline is bent in flat wire and soldered to the ground. In either case the resulting cells are filled with coloured paste, which, under the action of the fire, vitrifies and becomes embodied with the metal. In champlevé enamel naturally the metal ground is usually a distinguishing feature. In cloisonné the ground as well as the pattern is, of course, in enamel; but in either case the outlines, and, indeed, all drawing lines, are in metal. In cloisonné enamel the metal “cloisons,” as they are called, fulfil precisely the function of the leads in glass windows; and it would have been more convenient to have left altogether out of account the sister process, were it not that, in the painting of quite early glass, the strokes with which the lines of the drapery and suchlike are rendered, bear quite unmistakable likeness to the convention of the Byzantine worker in champlevé. For that matter, one sees also in very early altar-pieces painted on wood, where gold is used for marking the folds of drapery, the very obvious inspiration of Byzantine enamel—but that is rather by the way.

The popular idea of an early window is that of a picture, or series of pictures, very imperfectly rendered. It may much more justly be likened to a magnified plaque of Byzantine enamel with the light shining through it. The Byzantine craftsman, or his descendants, at all events, did produce, in addition to the ordinary opaque enamel, a translucent kind, in imitation presumably of precious stones; and it might very well be that it was from thence the glazier first derived the idea of coloured windows. Quite certainly that was nearer to his thoughts than any form of painting, as we understand painting nowadays; and, what is more, had he aimed deliberately at the effect of enamel (as practised in his day), he could not have got much nearer to it. His proceeding was almost identical with that of the enamel worker. In place of vitreous pastes he used glass itself; in place of brass, lead; and, for supplementary detail, in place of engraved lines, lines traced in paint. Side by side with the early European window glazing, and most likely before it, there was practised in the East a form of stained glass window building of which no mention has yet been made. In the East, also, windows were from an early date built up of little pieces of coloured glass; but the Mohammedan law forbidding all attempt at pictorial representation of animate things, there was no temptation to employ painting; the glazier could do all he wanted without it. His plan was to pierce small openings in large slabs of stone, and in the piercings to set numerous little jewels of coloured glass. The Romans, by the way, appear also to have sometimes filled window spaces with slabs of marble framing discs of coloured glass, but these were comparatively wide apart, more like separate window-lets, each glazed with its small sheet of coloured glass. The Oriental windows, on the contrary, were most elaborately designed, the piercings taking the form of intricate patterns, geometric or floral. Sometimes the design would include an inscription ingeniously turned to ornamental use after the manner of the Moorish decorators of the Alhambra (page 15). A further development of the Oriental idea was to imbed the glass in plaster, a process easy enough before the plaster had set hard. This kind of thing is common enough in Cairo to this day, and specimens of it are to be found at the South Kensington Museum.

6. Arab Lattice, Floral.

M. Vogué illustrates in his book, La Syrie Centrale, an important series of windows in the Mosque of Omar (Temple of Jerusalem), erected in 1528, by Sultan Soliman. The plaster, says M. Vogué, was strengthened by ribs of iron and rods of cane imbedded in the stouter divisions of the framework, a precaution not necessary in the smaller Cairene lattices (measuring as a rule about four superficial feet), in which the pattern is simply scooped out of the half-dry plaster.

The piercings in these Oriental windows and window lattices are not made at right angles to the slab of stone or plaster, but are cut through at an angle, varying according to the position and height of the window, with a view to as little interference as possible with the coloured light. The glass, however, being fixed nearest the outside of the window, there is always both shadow and reflection from the deep sides of the openings, much to the enhancement of the mellowness and mystery of colour. In the Temple windows referred to, still further subtlety of effect is arrived at by an outer screen or lattice of faïence. Thus subdued and tempered, even crude glass may be turned to beautiful account.

7. Arab Glazing in Plaster.

Whence the mediæval Arabs got their glass, and the quality of the material, are matters of conjecture. If we may judge by the not very ancient specimens which reach us in this country, the glass used in Cairene lattices is generally thin and raw; but set, as above described, in jewels as it were, isolated each in its separate shadow cell, the poorest material looks rich. The lattices here illustrated are none of them of very early period; but, where the character of design is so traditional and changes so slowly, the actual date of the work, always difficult to determine, matters little.

8. Arab Glazing in Plaster.

It is more than probable, it is almost certain, that the Venetian glass-workers, who in the tenth century brought their art to France, were familiar with the coloured lattices of the Levant; for, as we know, in the middle-ages Venice was the great trading port of Italy, in constant communication with the East. If that was so, the Italians, always prone to imitate, would be sure to found their practice, as they did in other crafts, more or less upon Persian and Arabian models. At all events, there is every reason to suppose that at first they, practically speaking, only did in lead what the Eastern artificer did in stone or plaster, and that the windows which, according to various trustworthy but vague accounts, adorned the early Christian basilicas as early as the sixth century, bore strong likeness to Mohammedan glass—Christianised, so to speak. This is not to unsay what was before said about the affinity of early glass to enamel. A river has not of necessity one only and unmistakable source; and though we may not be able to trace back through the distant years the very fountain of this craft, we may quite certainly affirm that its current was swollen by more than one side-stream, and that its course was shaped by all manner of obstinate circumstances and conditions of the time, before it went to join the broad and brimming stream of early mediæval art.

One more source, at least, there was at which the early glazier drew inspiration—namely, the art of jewel setting. Coloured glass, as was said a while ago, was itself probably first made only in imitation of precious stones, and, being made in small pieces, it had to be set somewhat in the manner of jewellery. In all probability the enameller himself wrought at first only in imitation of jewellery, and afterwards in emulation with it.

Just as white glass was called crystal, and no doubt passed for it, so coloured glass actually went by the name of ruby, sapphire, emerald, and so on. It is recorded even (falsely, of course) how sapphires were ground to powder and mixed with glass to give it its deep blue colour; indeed, this wilful confusion of terms goes far to explain the mystery of the monster jewels of which we read in history or the fable which not so very long ago passed for it. Stories of diamond thrones and emerald tables seem to lead straight into fairyland; but the glass-worker explains such fancies, and brings us back again to reality.

Bearing in mind, then, the preciousness of glass, and the well-kept secrecy with regard to its composition, it is not beyond the bounds of supposition that the glazier of the dark ages not only intended deliberately to imitate jewellery, but meant that his glass should pass with the ignorant (we forget how very ignorant the masses were) for veritably precious stones.

9. Arab Glazing in Plaster.

Even though we exempt glaziers from all charge of trickery, it was inevitable that they should attempt to rival the work of the jeweller, and to do in large what he had done only in small. That certainly they did, and with such success that, even when it comes to glass of the twelfth, and, indeed, of the thirteenth century, when already pictorial considerations begin to enter the mind of the artist, the resemblance is unmistakable.

Try to describe the effect of an early mosaic window, and you are compelled to liken it to jewellery. Jewelled is the only term which expresses it. And the earlier it is the more jewel-like it is in effect.

So long as the workman looked upon his glass as a species of jewellery, it followed, as a matter of course, from the very estimation in which he held his material, that he did not think of obscuring it by paint—defiling it, as he would have held. It is not so much that he would have been ashamed to depend on the painter to put his colour right, as that the thought of such a thing never entered his mind; he was a glazier. It was the painter first thought of that, and his time had not yet come.

Possibly it may have occurred to the reader, apropos of the diagram on page 10, in which it was shown how far the glazier could go towards the production of a map in glass, that that was not far. Certainly he does not go very far towards making a chart of any geographical value, but he does go a long way towards making a window; for the first and foremost qualities in coloured glass are colour and translucency—and for translucent colour the glazier, after the glass-maker, is alone responsible. It is in some respects very much to be deplored that the Gothic craftsman so early took to the use of supplementary painting, which in the end diverted his attention from a possible development of his craft in a direction not only natural to it but big with possibilities never to this day realised.

10. Glazing in Plaster. South Kensington Museum.

Of richly jewelled Gothic glass all innocent of paint, no single window remains to us; but there are fairly numerous examples extant of pattern windows glazed in white glass, whether in obedience to the Cistercian rule which forbade colour, or with a view to letting light into the churches—and it is to churches, prevalent as domestic glass may once have been, we must now go for our Gothic windows.

Some of this white pattern work is ascribed to a period almost as early as that of any glass we know; but it is almost impossible to speak positively as to the date of anything so extremely simple in its execution; in which there is no technique of painting to tell tales; and which, when once “storied” windows came into fashion, was probably left to the tender mercies of lesser craftsmen, who may not have disdained to save themselves the trouble of design, and to repeat the old, old patterns.

The earlier glazier, it was said, painted, figuratively speaking, in glass. It is scarcely a figure of speech to say that he drew in leadwork.

This mode of draughtsmanship was employed in all strictly mosaic glass; but it is in the white windows (or the pale green windows, which were the nearest he could get to white, and which it is convenient to call white) that this drawing with the leads is most apparent—in patterns, that is to say, in which the design is formed entirely by the leadwork.

11. Plain Glazing, Bonlieu.

You have only to look at such patterns as Nos. 11 to 17, to see how this was so; they are all designed in outline, and the outline is given in lead. It is perfectly plain there how every separate line the glazier laid down in charcoal upon his bench stood for a strip of lead. And, looking at the glass, we see that it is the lead which makes the pattern. It is no straining of terms to call this designing in the lead. The ingenuity in designing such patterns as those below and opposite, which is very considerable, consists in so scheming them that every lead line shall fulfil alike a constructive and an artistic function; that is to say, that every line in the design shall be necessary to its artistic effect, that there shall be no lead line which is not an outline, no outline which is not a lead.

12. Châlons.

It is not always that the glazier was so conscientious as this. M. Viollet le Duc pointed out, in the most helpful article in his famous Dictionary of Architecture, under the head of Vitrail, how in the little window from Bonlieu, here illustrated, the mediæval craftsman resorted to a dodge, more ingenious than ingenuous, by which he managed to economise labour. Each separate lead line there does not enclose a separate piece of glass. The lines are all of lead; but some of them are mere dummies, strips of metal, holding nothing, carried across the face of the glass only, and soldered on to the more businesslike leads at each end. The extent of bonâ fide glazing is indicated in the right-hand corner of the drawing. I confess I was inclined at first to think that Viollet le Duc might, in ascribing this glass to the twelfth century, very possibly have dated it too far back; for this is the kind of trick one would more naturally expect from the later and more sophisticated workman; but I have since come upon the same device myself, both at Reims and Châlons, in work certainly as old as the thirteenth century. You see, cutting the glass was the difficulty in those days, and sometimes it was shirked.

13. Châlons.

It should be noted that the subterfuge employed at Bonlieu and in the specimens from Châlons, opposite, was not in order to evade any difficulty in glazing—the designs present none—but merely to save trouble. There would have been more occasion for evasion in executing the design from Aix-la-Chapelle (14), where the sharp points of the fleur-de-lys give background shapes difficult for the glazier to cut. It will be noticed that to the left of the panel one of the points joins the necking-piece, which holds the fleur-de-lys together. That is a much more practical piece of glazing than the free point, which presents a difficulty in cutting the background, indicative of the late period to which the glass belongs. The earlier mediæval glazier worked with primitive tools, which kept him perforce within the bounds of simplicity and dignified restraint.

In white windows, so called, he did not by any means confine himself wholly to the use of what it is convenient to call “white glass.” From a very early date, perhaps from the very first, he would enrich it with some slight amount of colour. Having devised, as it were, a lattice of white lines, as in the left-hand pattern from Salisbury (overleaf), it was a very simple thing to fill here and there a division of his design with a piece of coloured instead of white glass, as in the pattern next to it in order. The third pattern, to the right, shows how he would even introduce a separate jewel of colour, perhaps painted, which had to be connected with the design by leads forming no part of the pattern.

Colour spots are more ingeniously introduced in the example from Brabourne Church, Kent, (said to be Norman) where the darker tints are ingeniously thrown into the background. But here again, although this is perhaps as early a specimen of glazing as we have in this country, the glazier resorts in his central rosettes to the aid of paint.

14. Aix-la-Chapelle.

It will be observed that in the marginal lines which frame this window, and again in the white bands in two out of the three patterns from Salisbury, leads are introduced which have only a constructional use, and rather confuse the design. That they do not absolutely destroy it is due to its marked simplicity, and to the proportion of the narrow bands to the broad spaces. This is yet more clearly marked in the very satisfactory glazing designs from S. Serge at Angers. The fact is, there is a limit to the possibilities of design, such as that from Sens (page 96), in which literally only four leads (viz., those from the points of the central diamond shape) are introduced wholly and solely for strength; and when it comes to windows of any considerable size, such as clerestory windows, to which plain glazing is peculiarly suited, leads which merely strengthen become absolutely necessary. The art of the designer consists in so scheming them that they shall not seriously interfere with the pattern.

15. South Transept, Salisbury.

Were the pattern in lines of colour upon white, the crosslines strengthening them would of course be lost in the darker tint; but, as it happens, we do not find in the earliest glazing lines of interlacing colour, though they occur by way of border lines, as at S. Serge (below), where a marginal line of yellow is enclosed between strips of white.

16. Brabourne Church Kent.

The interlacing character of several of the white glazing patterns illustrated betrays of course Romanesque influence; but there would not have been so many designs consisting of interlacing bands of white upon a white ground, enclosing, at intervals more or less rare, what had best be called jewels of colour, had it not been that the forms of interlacing strapwork lend themselves kindly to glazing.

17. S. Serge, Angers.

Every time a strap disappears, as it were, behind another, you have just the break in its continuity which the glazier desires, and if only the interlacings are frequent enough (as on page 96) they give him all he wants.

So far the examples illustrated are, for the most part, in outline; that is to say, on a ground of white the pattern appears as a network of leads, flowing or geometric as the case may be, emphasised here and there by a touch of dark colour, focussing them as it were. Without such points of colour a design looks sometimes too much like a mere outline, meant to be filled in with colour, and, in short, unfinished; but as yet the darker and lighter tints of white are not used to emphasise the pattern, as they would have done if, for example, the interlacing straps had been glazed in a slightly purer white than the ground. On the contrary, notwithstanding the very great variety in the tints of greenish-white, which resulted from the chemically imperfect manufacture of the glass, they were employed very much at haphazard, and so far from ever defining the design, go to obviate anything harsh or mechanical there may be in it. There is else, of course, a tendency in geometric pattern to look too merely geometric. One wants always to feel it is a window that is there, and not just so many feet of diaper.

Another practical form of design is that in which it is not the network of leads, but the spaces they inclose, which constitutes the pattern; where lines are not so much thought of as masses; where the main consideration is colour, and contour is of quite secondary account. The leads fulfil still their artistic function of marking the division of the colours, as they fulfil the practical one of binding the bits of coloured glass together; the glazier still draws in lead lines; but attention is not called to them especially; indeed, with identically the same lead lines one could produce two or three quite different effects, according as one emphasised by stronger colour one series of shapes or another. In the case of a framework of strictly geometric lines, straight or curved, one gets patterns such as we see in marble inlay. The slab of marble mosaic and the stained glass border opposite are more than alike; the one is simply a carrying further of the other. The glass design might just as well have been executed in marble, or the marble design in glass. In the upper church at Assisi are some borders of geometric inlay, one of which is given on page 96, identical in character with the minute geometric inlay (which, by the way, was also in glass, though opaque), with which the Cosmati illuminated, so to speak, their marble shrines and monuments. This species of pattern work, appropriate as it is to glass mosaic, transparent as well as opaque, does not seem to have been much used in glass, even in Italy; where it does occur it is in association, as at Assisi and Orvieto, with painted work of the thirteenth or fourteenth century, though from its Byzantine character it might as well be centuries earlier. It appears that this, which was, theoretically, the simplest and most obvious form of leaded pattern work, and might, therefore, well have been the earliest, was never adopted to anything like the extent to which interlacing ornament was carried.

18. Marble Mosaic, Roman.

Mediæval glaziers did not attempt anything like foliated ornament in leaded glass, and for good reason. In such work the difficulty of doing without lines detrimental to the design is greatly increased, whereas abstract forms you can bend to your will, as you can bend your strip of lead. The more natural the forms employed the more nature has to be considered in rendering them, and nature declines to go always in the direction of simple glazing. It might seem easy enough (to those who do not know the difficulty) to glaze together bits of heart-shaped green glass for leaves, and red for petals, with a dot of yellow for the eye of the flower, and to make use of the lead not only for outlines but for the stalks of the leaves and so on, all on a paler ground; but it is not so easy as that. The designer cannot go far without wanting other connecting leads (besides those used for the stalk); and when some leads are meant very emphatically to be seen and some to be ignored, there is no knowing what the actual effect may be: the drawing lines may be quite lost in a network of connecting leads. Again, the mediæval glazier did not, so far as we have any knowledge, build up in lead glazing a boldly pronounced pattern, light on dark or dark on light. This he might easily have done. On a small scale plain glazing must perforce be modest; but, given a scale large enough, almost any design in silhouette can be expressed in plain glazing. You may want in that case plenty of purely constructional leads, not meant to be seen, or in any case meant to be ignored; but if the contrast between design and background be only strong enough (say colour on white or white on colour), they do not in the least hurt the general effect. On the contrary, they are of the utmost use to the workman who knows his materials, enabling him to get that infinite variety of colour which is the crowning charm of glass.

19. Glass, Orvieto.

What the designer of leaded glass had to consider was, in the first place, the difficulty of shaping the pieces. That is now no longer very great, thanks to the diamond, which makes cutting so easy that there is even a danger lest the workman’s skill of hand may outrun his judgment, and tempt him to indulge in useless tours de force. The absurdity of taking the greatest possible pains to the least possible purpose is obvious. The more important consideration is now, therefore, the substantiality of the window once made. Think of the force of a gale of wind and its pressure upon the window: it is tremendous; and glazing does not long keep a smooth face before it. Except there is a solid iron bar to keep it in place, it soon bulges inwards, and presents a surface as undulous, on a smaller scale, as the pavement of St. Mark’s; and, as it begins to yield, snap go the awkwardly shaped pieces of glass which the glazier has been at such pains to cut. The mediæval artist, therefore, exercised no more than common sense, when he shaped the pieces of glass he employed with a view to security, avoiding sharp turns or elbows in the glass, or very long and narrow strips, or even very acutely pointed wedge-shaped pieces. No doubt the difficulty of cutting helped to keep him in the way he should go; probably, also, he was under no temptation to indulge in pieces of glass so large that, incapable of yielding, they were bound to break under pressure of the wind. That he sometimes used pieces so small as in time to get clogged with dust and dirt, was owing to the natural desire to use up the precious fragments which, under his clumsy system of cutting, must have accumulated in great quantity. Where most he showed his mastery was, in foreseeing where the strain would come, and introducing always a lead joint where the crack might occur, anticipating and warding off the danger to come. He was workman enough frankly to accept the limitations of his trade. Occasionally (as at Bonlieu) he may have shirked work; but he accommodated himself to the nature of his materials. Never pretending to do what he could not, he betrayed neither its weakness nor his own.

Mere glazing has here been discussed at a length which perhaps neither existing work of the kind nor the modern practice of the craft (more is the pity) might seem to demand. It is the most modest, the rudest even, of stained glass; but it is the beginning and the foundation of glass window making, and it affects most deeply even the fully developed art of the sixteenth century.

The leading of a window is the framework of its design, the skeleton to be filled out presently and clothed in colour; and, if the anatomy is wrong, nothing will ever make the picture right. The leads are the bones, which it is necessary to study, even though they were intrinsically without interest, for on them depends the form which shall eventually charm us. Beauty is not skin deep: it is the philosophy of the poet which is shallow.