In contrast to the Roman ornament, in which the effect depended mostly on light and shade, the Byzantine was a colour style, and it became customary to line the walls of the principal buildings with marble slabs quartered and placed reciprocally, so that the figurings formed symmetrical patterns. Mosaic work, either of marble or glass, constituted the decoration in such suitable positions as the floors, spandrils, lunettes and domes, gold being largely employed in the backgrounds. Windows, at times large in area, were glazed as in Roman times with cast slabs of glass, set in metal frames, usually bronze; and thin slabs of translucent marble and onyx were also used for glazing purposes.
Metal Work and Enamel
The Byzantines were also expert carvers of ivory and workers in metal, decorated in repoussé and with wire filigree; the metal work was invariably set with jewels and precious stones, in conjunction with champleve enamel, the whole being gilt.
As a result of the Iconoclastic movement, and the decree of Pope Leo III in 726 A.D., the art workers, deprived of local patronage and compelled to pursue their crafts elsewhere, migrated to the Rhine district, where for some centuries the Byzantine traditions were preserved and largely influenced Western art, particularly with regard to the working in metal and enamels. The attraction of the centre of the Eastern Empire for northern adventurers had its effect in the introduction of the Byzantine style into the detail of the different phases of the Romanesque.
No. 41. Champleve enamel Byzantine tradition.
The tradition thus becoming widely known was finally absorbed by local craftsmen and modified according to local conditions, with the result that both in expression and in execution, the style tended to become more and more crude, until the original forms and details were almost entirely lost. But in spite of changes the classic feeling never completely died out.
Roman Influence Abroad
Under the Roman system, in colonizing, their architecture, customs and laws were imposed on the conquered population. When later, under stress of events, the governing bodies and military forces had to be withdrawn, these left behind them universal traces of their occupation and influence. The inhabitants of the provinces thus abandoned and thrown on their own resources, were immediately menaced by invasions, which had been hitherto kept in check by the armies of occupation, and for some protracted period ensued a condition of unrest and conflict, under which the arts naturally suffered. Eventually, from the chaos emerged a native manner of building, which, though rude and coarse in execution, was based on the Roman tradition.