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MOSAIC (corresponding to Lat. opus mu...

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Originally appearing in Volume V18, Page 890 of the 1911 Encyclopedia Britannica.
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MOSAIC (corresponding to See also:Lat. See also:opus musivum, from Gr. µovoeiov, an artificial grotto often decorated with mosaics; the word is only found in the sense of mosaic in See also:late See also:Greek, which generally uses k oXI yrlµa)  , the fitting together of many, generally small, pieces of See also:marble, opaque See also:glass, coloured See also:clays, or other substances, so as to See also:form a See also:pattern . See also:Ancient See also:Mosaic.—The earliest existing specimens of mosaic belong to one of the less important branches of the See also:art—namely, the ornamentation on a small See also:scale of jewellery, See also:ivory thrones, and other See also:furniture, or more rarely of some elaborate architectural See also:ornament . Most of this sort of mosaic resembles in See also:execution what are called cloisonne enamels . In the Louvre and in the See also:British Museum are preserved some very beautiful ivory carvings in See also:low See also:relief, some from See also:Nineveh and others from See also:Egypt, in which figures of deities, ornaments formed of the See also:lotus and See also:papyrus See also:plants and royal cartouches are enriched by small pieces of glass, or lapis-lazuli and other See also:gem-like stones, which are let into holes made in the ivory . Each See also:minute piece is separated from the next by a thin See also:wall or cloison of ivory, about as thick as cardboard, which thus forms a See also:white outline and sets off the brilliance of the coloured stones . Excavations at Tel-el-Yehudia in See also:Lower Egypt have brought to See also:light some mosaics on a larger scale, but treated in the same way . These are caps of columns, wall tiles, and other See also:objects, either of white See also:limestone or earthenware, in which designs, chiefly some forms of the papyrus, are formed by bits of glass or enamelled earthenware, let into a sinking in the the or See also:column . This form of mosaic was employed by the Greeks: the See also:Erechtheum at See also:Athens, built in the See also:middle of the 5th See also:century B.C., had the bases of some of its white marble columns ornamented with a See also:plait-like See also:design, in which pieces of coloured glass were inserted to emphasize the See also:main lines of the pattern . Another, quite different, sort of mosaic was known to the Egyptians of the Ptolemaic and See also:Roman periods . This is made entirely of glass and is extremely minute . The finest known specimen is in the British Museum: it is a small tablet about s in. square, apparently the See also:bezel of a See also:ring, on which is represented the sacred See also:hawk—every See also:feather on the See also:bird's wing being produced with a See also:great number of See also:colours and tints, each quite distinct, and so minute that a strong magnifying glass is required to distinguish its details, The way in which this mosaic was produced is extremely ingenious . See also:Numbers of See also:long sticks of various-coloured glass were arranged in such a way that their ends produced the figure of the hawk; other sticks of See also:blue glass were placed all See also:round so as to form the ground .

The whole bundle of sticks of glass when looked at endwise now presented the figure of the hawk with a blue background, immensely larger than it after-wards became . The bundle was then heated till the sticks melted together, and the whole thick See also:

rod, softened by See also:fire, was See also:drawn out to a greatly diminished thickness . A slice of the rod was then cut off and its faces polished—the design, much reduced in See also:size, of course being equally visible at both sides of the slice; and thus the microscopic minuteness of the mosaic was produced with astonishing delicacy and refinement; many slices, each showing the same mosaic. could be cut from the same rod . Far more important was the use of mosaic on a large scale, either for pavements or for walls and vaulted ceilings . We are told by See also:Pliny (H . N. See also:xxxvi . 184) that the practice of decorating pavements " after the See also:fashion of See also:painting was due to the Greeks, and there is no See also:reason to doubt the truth of this statement, although no mosaic See also:pavement discovered in See also:Greece can be dated with certainty to a See also:period preceding the Roman occupation . This is true even of the pavement in the See also:temple of See also:Zeus at See also:Olympia (fig . 1; Olympia, Baudenkmdler, vol. ii. pl. cv.) . The simplest See also:classification of mosaics is that of Gauckler (Daremberg and Saglio, Dictionnaire See also:des anliquites, s.v . " Musivum See also:Opus "), who distinguishes the following: a . Opus . tessellatum, consisting of cubes of marble or See also:stone, regularly disposed in See also:simple patterns .

This was largely used for pavements, especially in Roman times . b . Opus vermiculatum, consisting of cubes (not always regularly shaped) generally of coloured See also:

marbles or more See also:precious materials, when these were obtainable, disposed so as to obtain a pictorial effect . The art of mosaic is mainly concerned with this See also:branch of See also:work . c . Opus musivum, properly applied to the mosaic decoration of walls and vaulted ceilings (camerae), in which cubes of glass or See also:enamel were used . The glass was rendered opaque by the addition of See also:oxide of See also:tin, and coloured with other metallic oxides; when melted it was See also:cast into See also:flat slabs, generally about 2 in. thick, and then broken into small cubes . d . Opus sectile, a See also:species of marqueterie in marble or other coloured materials used to produce pictures and patterns . Under the later See also:empire a particular variety of this, called opus alexandrinum2 mainly composed of See also:porphyry, red and See also:green,' was much in use . Judging from the description given by See also:Vitruvius (vii . I), and an examination of numerous specimens of Roman See also:tessellated mosaics, the See also:process of manufacture was the following .

The See also:

earth was first carefully rammed down to a See also:firm and even See also:surface; on this was laid a thick See also:bed of stones, dry rubbish, and See also:lime, called " rudus," from 6 to 9 in. deep, and above this another layer, 4 to 6 in. thick, called " See also:nucleus," of one See also:part of lime to three of pounded See also:brick, mixed with See also:water; on this, while still soft, the pattern could be sketched out with a wooden or See also:metal point, and the tesserae or small bits of marble See also:stuck into it, with their smoothest See also:side uppermost . Lime, pounded white marble, and water were then mixed to the consistency of cream, forming a very hard-setting See also:cement, called marmoratum . This cement, while fluid, was poured over the marble surface, and well brushed into all the interstices between the tesserae . When the See also:concrete and cement were both set, the surface of the pavement was rubbed down and polished . The usual Roman pavement was made of pieces of marble, averaging from See also:half to a See also:quarter of an See also:inch square, but rather ' In the less prosperous provinces of the empire, such as See also:Britain, these costly materials could not be obtained, and native See also:sandstone, &c., was used . 2 The biographer of See also:Severus See also:Alexander (Hist . Aug., c . 25, 7) attributes the invention of opus alexandrinum to that See also:emperor; but this is clearly a false derivation . This technique was doubtless invented at See also:Alexandria . 3 This latter is often, but wrongly, called See also:serpentine.irregular in shape . A few other, but quite exceptional, kinds of mosaic pavements have been found, such as that at the Isola See also:Farnese, 9 m. from See also:Rome, made of See also:tile-like slabs of green glass, and a See also:fine "sectile " pavement on the See also:Palatine See also:Hill, made of various-shaped pieces of glass, in See also:black, white, and deep yellow . In some cases—e.g. in the " See also:House of the Faun " at See also:Pompeii—glass tesserae in small quantities have been mixed with the marble ones, for the See also:sake of greater brilliance of See also:colour .

Few countries are richer than See also:

England in remains of Roman mosaics; the great pavements of See also:York, Woodchester, See also:Cirencester, and many other places are as elaborate in design and as skilfully executed as any that now exist even in Rome itself . In what-ever See also:country these mosaics are found, their See also:style and method of treatment are always much the same; the materials only of which the tesserae are made vary according to the stone or marble supplied by each country . In England, for instance, limestone or See also:chalk often takes the See also:place of the white marble so See also:common in See also:Italian and See also:North See also:African mosaics; while, instead of red marble, a fine sort of burnt See also:clay or red sandstone is generally used; other makeshifts had to be resorted to, and many of the Romano-British mosaics are made entirely without marble . It is perhaps partly owing to the great See also:wealth of See also:Northern See also:Africa in marbles of many colours and of varying shades that the finest of all Roman mosaics have been found in See also:Algeria and See also:Tunis, especially those from See also:Carthage, some of which have been brought to the British Museum . See Archaeologic, xxxviii . 202 . The range of colour in the marble tesserae is very great, and is made use of with wonderful See also:taste and skill: there are three or four different shades of red, and an equal number of yellows and greens, the last colour in all its tints being almost See also:peculiar to this part of Africa, and one of the most pleasant and harmonious in almost any See also:combination . Deep black, browns and bluish-greys are also abundant . The mosaics from Carthage are no less excellent in design than in the richness and beauty of their materials . Large spaces are filled by See also:grand sweeping curves of See also:acanthus and other leaves, drawn with wonderful boldness and freedom of See also:hand, and varied with great wealth of invention . Without the use of very small tesserae, much richness of effect is given by gradations of tints, suggesting light and \rr,rirt,f'rrrrrrrr rnrrnrrn nrrrrrrrrrr rrrrnr,rrY II shade, without a painful See also:attempt to represent actual relief . The colours of the marbles used here and elsewhere by the See also:Romans are so quiet and harmonious that it would have been almost impossible to produce with them a harsh or glaring design, and when used with the skill and strong See also:artistic feeling of the mosaic workers at Carthage the result is a real masterpiece of decorative design .

The finest of the later examples in Rome is that which decorates the vault of the See also:

ambulatory of the circular See also:church of S . Costanza, built by See also:Constantine the Great, outside the walls of Rome . This very interesting mosaic might from its style and materials have been executed in the 1st century, and is equal in beauty to any work of the See also:kind in See also:Italy . It shows no trace whatever of the See also:Byzantine See also:influence which, in the next century, introduced into Italy a novel style of mosaic, in materials of the most glittering splendour . Survivals of this classical style of mosaic are found in North Africa and the See also:East . At Kabr-Hiram, near See also:Tyre, See also:Renan discovered among the ruins of a small three-apsed See also:Christian church of the 4th century A.D. a fine mosaic pavement, covering the See also:nave and aisles, thoroughly classical in style . A very similar mosaic, of about the same date, was discovered at Nebi Yunas, near See also:Sidon . See also:Medieval Mosaics.—These may be divided into four See also:principal classes: (1) those used to decorate walls and vaults, made of glass cubes; (2) those for pavements, made of marble, partly in large shaped pieces, and partly in small tesserae; (3) glass in small pieces, either rectangular or triangular, used to enrich marble pulpits, columns, and other architectural features; (4) See also:wood mosaics . 1 . In the Byzantine period the glass See also:cube mosaic was exclusively employed in mural decoration . At first natural colouring was used, and backgrounds, if not in See also:local colour, were generally blue; but the use of See also:gold, both for backgrounds and for the high See also:lights on drapery, &c., gradually prevailed . Owing to the intense conservatism of Byzantine art, no See also:regular stages of progression can be traced in this class of mosaic .

Some of the 5th-century mosaics at See also:

Ravenna are, in every way, as fine as those of the 12th, and it was not till the end of the 13th century that any important See also:change in style took place . The mosaics of the 9th century are inferior in See also:drawing and See also:general treatment to those both of the earlier and later See also:time, while in Italy at least this art was almost entirely See also:extinct during the loth and rrth centuries . Extreme splendour of colour and See also:jewel-like brilliance combined with the most stately grandeur of form are the main characteristics of this sort of decoration . A " See also:majesty," or See also:colossal central figure of See also:Christ with See also:saints See also:standing on each side, is the most frequent See also:motive . In many cases, especially in the 5th and 6th centuries, Christ was represented as a See also:lamb, to whom the twelve apostles, in the form of See also:sheep, are paying See also:adoration . Christ, the See also:Good Shepherd, is sometimes depicted as a beardless youth, seated among a circle of sheep—the treatment of the motive being obviously taken from See also:Pagan representations of See also:Orpheus playing to the beasts . The See also:tomb of Galla Placidia has a good example of this subject, with much of the old Roman See also:grace in the drawing and See also:composition . Frequently the Virgin See also:Mary, or the See also:patron See also:saint of the church, occupies the central space in the See also:apse, with ranges of other saints on each side . The " See also:Doom," or Last See also:Judgment, is a favourite subject for domes and See also:sanctuary See also:arches; the See also:Florence.See also:baptistery has one of the grandest mosaic pictures of this subject, executed in the 13th century . The earlier baptisteries usually subject, the See also:scene of Christ's See also:baptism—the See also:river See also:Jordan being sometimes personified in a very classical manner, as an old See also:man with flowing See also:beard, holding an See also:urn from which a stream pours forth . S . Vitale at Ravenna has in the sanctuary a very interesting See also:representation of Justinian and his empress See also:Theodora (see fig .

3), attended by a numerous See also:

suite of courtiers and ladies ; these mosaics are certainly of the 6th century, and may be contemporary with Justinian, though the fact that he and Theodora are each represented with a circular nimbus appears to indicate that they were not then alive . In mosaics of the best periods the treatment of the forms and draperies is broad and simple, a just amount of relief being expressed by delicate gradations of tints . In mosaics of the 9th century the drawing is very awkward, and the folds of the See also:robes are rudely expressed in outline, with no See also:suggestion of light and shade . A further application of this work was to the decoration of broad bands over the columns of the nave, as at S . Maria See also:Maggiore in Rome, 4th century, and in the two churches of S . Apollinare at Ravenna, 6th century . In some cases almost the whole 885 interior of the church was encrusted in this magnificent way, as at See also:Monreale See also:Cathedral, the See also:Capella Palatina of See also:Palermo, and S . See also:Mark's at See also:Venice . In these churches the mosaics See also:cover soffits and angles entirely, and give the effect of a See also:mass of solid gold and colour producing the utmost conceivable splendour of decoration) . In many cases vaulted ceilings were covered with these mosaics, as the tomb of Galla Placidia, A.D . 450, and the two baptisteries at Ravenna, 5th and 6th centuries . For exteriors, the large use of mosaic was usually confined to the See also:west See also:facade, as at S .

Miniato, Florence; S . Maria Maggiore, Rome; and S . Mark's, Venice . In almost all cases the figures are represented on a gold ground, and gold is freely used in the dresses and ornaments —See also:

rich jewels and See also:embroidery being represented in gold, See also:silver, sparkling reds, blues and other colours, so as to give the utmost splendour of effect to the figures and their drapery . The revival of the art of painting in Italy and the introduction of See also:fresco work in the 14th century gave the deathblow to the 1 Unfortunately the See also:world-wide fame of S . Mark's and the other great churches of Italy has subjected these extraordinary See also:works to the fatal process of " restoration," and wherever any sign of decay in the cement backing (the tesserae themselves are quite indestructible) has given the least excuse the " restorers " have destroyed whole masses of ancient work, and supplied its place with worthless See also:modern copies . The mosaics of the S . Mark's baptistery, and of the apses at S . Miniato, at See also:Pisa, and many other places have in this way been wantonly renewed in See also:recent times . true art of wall-mosaics . Though at first the simple and archaic style of See also:Cimabue and his pupils Jacopo da Turrita, See also:Giotto, and Taddeo See also:Gaddi was equally applicable to painting or mosaic, yet soon the development of art into greater See also:realism and complexity required a method of expression unfettered by the necessities and canons of mosaic work . Pietro See also:Cavallini, a Roman artist, was one of the last who worked according to the old traditions .

His mosaic of the See also:

birth of the Virgin in S . Maria in Cosmedin, Rome, executed about the middle of the 14th century, is not without merit, though his See also:superior knowledge of form has only caused his composition to be somewhat feeble and insipid compared with the works of the earlier artists . Even in the r 5th century a few good mosaics were produced at Venice and else-where . The mosaics from See also:Titian's pictures on the west end of S . Mark's at Venice, See also:Raphael's in the Chigi See also:Chapel in S . Maria del Popolo, and many large pictures in S . See also:Peter's in Rome are the most striking examples of these . The following See also:list, in See also:chronological See also:order, comprises a selection from among the most important glass wall-mosaics during the period when mosaic-working was a real art.' . 4th Century . Rome . S . Costanza .

S . Maria Maggiore—square panels over the columns of the nave . S . Pudenziana . S . Giovanni in Laterano—chapel of SS . Rufina e Seconda . See also:

Naples . S . Restituta—baptistery . sth Century . Ravenna .

Orthodox Baptistery—vault . Tomb of Galla Placidia—vault, 450 . See also:

Archbishop's Chapel—vault . Rome . S . See also:Paolo fuori le mura—triumphal See also:arch . S . Maria Maggiore—square pictures over nave columns, and triumphal arch (?), S . Sabina—figures on west wall: See also:Milan . S . Ambrogio, Chapel of S . Satiro=vault .

Fundi . Cathedral—apse . See also:

Nola . Cathedral—apse . 6th Century . Ravenna . Arian Baptistery—vault . S . Apollinare Nuovo—apse and nave, with 9th-century additions . S . Vitale—apse and whole sanctuary, c . 547 .

S . Apollinare in Classe—apse and nave, 549 . Rome . SS . See also:

Cosmas and Damian—apse . Milan . S . Lorenzo, Chapel of S . Aquilinus—vault . See also:Constantinople . S . See also:Sophia—walls and vault, c .

550 . Thessalonica . Church of St See also:

George—apse, &c . ; and S . Sophia See also:dome and apse . See also:Trebizond . S . Sophia—apse . 7th Century . Rome . S . Agnese fuori le mura—apse, 626 .

S . Teodoro . S . Stefano Rotondo . S . Venanzio, baptistery of Lateran . See also:

Jerusalem . " Dome of the See also:Rock "—arches of ambulatory, 688 . 8th Century . Rome . Baptistery of S . Giovanni in Laterano .

SS . See also:

Nereus and See also:Achilles . Jerusalem . See also:Mosque of Al-Aksa—on dome . See also:Mount See also:Sinai . Chapel of the Transfiguration . 9th Century . Rome . S . See also:Cecilia in Trastevere—apse . S . Marco—apse .

S . Maria della Navicella—apse, and " Chapel of the Column." S . Prassede—triumphal arch . Milan . S . Ambrogio—apse, 832. zoth Century . See also:

Cordova . See also:Mihrab (sanctuary) of Mosque . zzth Century . Jerusalem . " Dome of the Rock "—See also:base of See also:cupola, 1027 . Constantinople .

Church of S . Saviour—walls and domes . 12th Century . Venice . S . Mark's—See also:

narthex, apse and walls of nave and aisles . 3 It must be remembered that the earlier mosaics have in most cases suffered much from restoration . See also:Capua . Cathedral—apse . See also:Torcello . Cathedral—apse . See also:Murano .

Cathedral—apse . See also:

Salerno: Cathedral—apse . Palermo . Capella Palatina, begun I132—the whole walls . Church of La Martorana—vault . Monreale . Cathedral—the whole walls, 1170-1190 . See also:Bethlehem . Church of the Nativity, 1169 . See also:Cefalu . Cathedral—apse, 1148 . Rome .

S . Clemente—apse . S . Francesca See also:

Romana—apse . S . Maria in Trastevere—apse . 13th Century . Florence . Baptistery vault, begun c . 1225 by Fra Jacopo . S . Miniato—apse and west front .

Rome . S . Paolo fuori le mura—apse . S . Clemente—triumphal arch, 1297 . S . Giovanni in Laterano—apse by Jacopo da Turrita, I290 . S . Maria Maggiore—apse and west end by Jacopo da Turrita and Taddeo Gaddi . S . Maria in Trastevere—apse by Pietro Cavallini, I291 . 14th Century .

Phoenix-squares

Florence . Baptistery, finished by See also:

Andrea Tafi . Pisa . Cathedral—east apse by Cimabue, 1302, north and See also:south apses by his pupils . Rome . S . Peter's—navicella, in See also:atrium by Giotto . S . Maria in Cosmedin—on walls by Pietro Cavallini, c . 1340 . Venice . SS .

Giovanni e Paolo—in arch over effigy of See also:

Doge See also:Morosini . The Byzantine origin of these great wall-mosaics, wherever they are found, is amply proved both by See also:internal and documentary See also:evidence . The gorgeous mosaics of S . Sophia and S . Saviour's in Constantinople, 6th century, and the later ones in the monasteries of Mount See also:Athos, at See also:Salonica and at See also:Daphne near Athens, are identical in style with those of Italy of the same date . Moreover, the even more beautiful mosaic work in the " Dome of the Rock " at Jerusalem, 7th and 11th centuries, and that in the sanctuary of the great mosque of Cordova, of the loth century, are known to be the work of Byzantine artists, in spite of their thoroughly See also:Oriental design . The same is the See also:case with the rarer mosaics of See also:Germany, such as those in S . Gereon at See also:Cologne and at See also:Parenzo . A very remarkable, almost unique, specimen of Byzantine mosaic is now preserved in the " See also:Opera del Duomo," Florence . This is a See also:diptych of the 11th century, of extremely minute, almost microscopic work, in tesserae of glass and metal, perhaps the only example of tesserae made of solid metal . It has figures of saints and See also:inscriptions, each tessera being scarcely larger than a See also:pin's See also:head . This beautiful diptych originally belonged to the imperial chapel in Constantinople, and was brought to Florence in the 14th century .

2 . The second medieval class, mosaic pavements, though of great beauty, are of less artistic importance . This so-called opus alexandrinum is very common throughout Italy and in the East, and came to greatest perfection in the 13th century . It is made partly of small marble tesserae forming the main lines of the pattern, and partly of large pieces used as a ground or See also:

matrix . It is generally designed in large flowing bands which interlace and enclose circles, often of one stone sliced from a column . The finest example is that at S . Mark's, Venice, of the 12th century . The materials are mainly white marble, with green and red porphyry, and sometimes glass . Besides the countless churches in Italy possessing these beautiful pavements, such as S . Lorenzo, S . Marco, S . Maria Maggiore, and S .

Maria in Trastevere, in Rome, there are in England, in the Chapel of the See also:

Confessor, and in front of the high See also:altar at See also:Westminster, very fine specimens of this work, executed about 1268 by a Roman artist called Odericus, who was brought to England by See also:Abbot See also:Ware, on the occasion of a visit made by the latter to Rome . Another See also:English example is the mosaic pavement in front of the See also:shrine of See also:Becket at See also:Canterbury; this is probably the work of an Englishman, though the materials are See also:foreign, as it is partly inlaid with See also:bronze, a peculiarity never found in Italy . Palermo and Monreale are especially rich in examples of sectile mosaic, used both for pavements and walls —in the latter case generally for the lower part of the walls the upper part being covered with the glass mosaics . Fig . 4 gives a specimen of this mosaic from Monreale cathedral . Its