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and the variety of construction programmes with which they had to comply left us with an even greater number of different types of buildings that we cannot find in Egypt, Syria or the Maghreb.

      Buildings in Persia, Mesopotamia and Turkistan were influenced by two building systems, both of which stem from earlier traditions. The platband with its columns and ceilings includes the roof framing and timber construction, the walls of which can either be made of baked or unbaked bricks, rough stones, or half-timberings covered with earth and bricks. This system of construction comes from Assyrian and Median art. Vaulted buildings, with arcades and without monolithic columns, from Chaldean and Persian traditions as well as Sassanian art, have only brick pillars as isolated support points, built on either a circular, octagonal, or square plan flanked by four attached columns. The Persians preferred the vault system because structural timber was absolutely lacking in a greater part of the country. Therefore, they quickly became very skilled at such construction. As a logical outcome of the construction system used, Persian architects concluded that the rib, which crimps the beam fillings and forms a resistant self-supporting network, is the most important component of the vault. Owing to this subdivision of the total surface area of the vault, construction work was made easier than that of huge barrel or groined vaults, good examples of which are found in extant ancient hot baths. They had at their disposal two types of artificial materials: baked and unbaked bricks.

      Bricks

      Unbaked brick constructions are essentially very fragile. From early times, humans initially saw the need to preserve their facings by covering them with baked bricks. A short while later, enamelled bricks were used, and it may just have been by chance, a result of accidental extreme baking, that ancient Chaldean architects discovered the possibility of glazing the external surface of bricks and took advantage of this feature to improve on solidity and beautify the decoration of their buildings.

      Since bricks do not easily lend themselves to projections, various skills are therefore required to create a play of shadows and lighting effects, either by using bricks laid out like the teeth of a saw or corbels. Corbels, however, cannot produce solid projections without a special arrangement that enables the creation of successive supports, whose bond stems from the type of materials used. Such is the case with the ajouré lattices of the minaret of the Great Mosque in Mosul, for example, which were intended to make the walls sufficiently solid without rendering them any lighter, or the creation of stalactites – a peculiar element in Islamic architecture, produced by a series of different squinches stacked up like corbels.

      The Registan, 17th century.

      Samarkand.

      The Sher-Dor Madrasa, 1619–1636.

      Samarkand.

      The Gur-e Amir Mausoleum, 1403–1405.

      Samarkand.

      Stalactites

      While stalactites are often nothing but relatively complex brick squinches, they can be remarkably developed. The use of stalactites in construction was not restricted to corbels, arches and cornices. They were also used to make entire vaults. Upon becoming a common motif in decoration, stalactites were used indiscriminately; they decorated interior arches, formed cornices, capitals, and even the crowns of minarets, and when this vault component was used in structural timber works, it lost its characteristic successive squinches and resembled juxtaposed prisms with flat surfaces. They were painted and gilded, regardless of whether they were made of wood or plaster. Finally, when a creative artist thought of decorating them with small pieces of glass, tinned in a way as to form some sort of glowing crystallisations which reflected light from every angle and appeared invisible, they invented one of the most elegant and original components of Persian architecture.

      Roofs

      Roofs of structural timber buildings are often terraces lined with terra-cotta tiles. For vaulted buildings, the roofing was most often formed by the extrados of the vault itself. For colossal domes or tombs, the need to have a pleasant outline inevitably required the use of either a higher dome supported by a drum (as in Isfahan, Shiraz and Samarkand), or a conical or polygonal roof circumscribing and sheltering the interior dome.

      Ornamentation

      Faience was the most luxurious component of architectural decoration in Persian buildings. Initially reduced to the size of enamelled bricks, contrasting with the pink background of baked bricks or the white tone of stuccos (Momine Khatun Mausoleum in Nakhchivan), enamelled decoration soon became very common in brick masonry. Then, in an attempt to create something different using drawings with rectilinear components, which is possible only with bricks, small enamelled fractions were cut and juxtaposed to create beautiful decorations of a faience marquetry, a kind of opus sectile that can be used alone or alongside baked bricks. The use of different types of enamelled terra-cotta tiles, whose juxtaposition allows for drawings or accurately glazed components in turquoise blue with reliefs, alternating with lustrous elements on a creamy white background, was initially used for sub-standard decoration, on panellings and mihrabs. In the 14th and 15th centuries, the palette of ceramists steadily improved, drawings became more complex, and finally, at the beginning of the 16th century in Ardebil, Sheik Sefi’s tomb was decorated with a wide range of possible applications of architectural ceramics: cornices with stalactites, fascia boards, friezes with inscriptions and enamelled brick domes. Buildings that were constructed or restored in Isfahan during Shah Abbas’s reign are also wonders of ceramic ornamentation, but the indiscriminate use of wall tiles is one of the main reasons for the dilapidation of these buildings. Abandoned without any maintenance and with the changing Persian climate, these coverings gradually fell off, and monuments less than four centuries old lost their adornment in a few years. Colours became more and more varied in the 17th century. Pink, light yellow, red and green added to the range of colours that were initially used: turquoise blue, brown, reddish brown, dark green, cobalt blue, white, violet and black. The decorations originally looked like carpets, then like the human figure, scenes with people, animals, and then real flowers were gradually introduced into this disarray, which quickly led to the decline of this beautiful art. Coloured stained-glass windows set in structures of cut plaster, friezes made of sculpted or moulded plaster or stuccos, precious wood inlays, precious metals, gildings, and later glass from Venice, paintings and impressive stars stitched with gold or silver – all these elaborate crafts added to the collections which we only know vaguely, either through the descriptions of travellers who did their best in describing what they had seen, or through books in which the presentation of these buildings and their decoration was often very vivid.

      In Persia, whose pre-16th century edifices are known today as exclusively religious or public buildings, there are still the palaces of the Safavid kings and their successors, as well as those of the main Persian lords that date back to the 17th century. Based on these examples, we can still clearly appreciate the splendour and taste of Persian courts as they were and see these ancient luxurious wonders that we know only through history books constructed today, as it were.

      We have seen the reasons that make us point to Mesopotamia as the cradle of Islamic architecture in Persia. As for monuments in Turkestan, they cannot be studied separately because they demonstrate a strong Persian influence: some buildings in Samarkand and Bukhara were erected by Persian architects from Shiraz or Isfahan. It would be very difficult to draw any kind of analogy between them, and to attribute all of them to a so-called Seljuq style, since Ottoman art is different from that of Persia, from a strictly architectural point of view.

      These foreign dynasties sometimes fairly contributed to modifying local styles by encouraging more frequent interactions between the peoples they united under their rule; by introducing the taste of enamelled coatings, as did the Seljuqs of Anatolia; by seeking to find, in the monuments that they were erecting in Edirne, some of the aspects of this luxurious decoration that they had admired in Persia; or by creating substantial colonies of Chinese ceramists, whose influence is clearly established by some details of faience coating used as ornamentation and tonality for coloured enamels. This is what Hulagu and Tamerlane did for Persia

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