Turkey. Turkish art refers to all works of visual art originating from the geographical area of what is present day since the arrival of the Turks in the Middle Ages. Turkey also was the home of much significant art produced by earlier cultures, including the Hittites, Ancient Greeks, and Byzantines. Ottoman art is therefore to the dominant element of Turkish art before the 20th century, although the Seljuks and other earlier Turks also contributed. The 16th and 17th centuries are generally recognized as the finest period for art in the Ottoman Empire, much of it associated with the huge Imperial court. In particular the long reign of Suleiman the Magnificent from 1520-1566 brought a combination, rare in any ruling dynasty, of political and military success with strong encouragement of the arts. The nakkashane, as the palace workshops are now generally known, were evidently very important and productive, but though there is a fair amount of surviving documentation, much remains unclear about how they operated. They operated over many different media, but apparently not including pottery or textiles, with the craftsmen or artists apparently a mixture of slaves, especially Persians, captured in war, trained Turks, and foreign specialists. They were not necessarily physically located in the palace, and may have been able to undertake work for other clients as well as the sultan. Many specialities were passed from father to son. Ottoman architecture developed traditional Islamic styles, with some technical influences from Europe, into a highly sophisticated style, with interiors richly decorated in coloured tiles, seen in palaces, mosques and turbe mausolea. Other forms of art represented developments of earlier Islamic art, especially those of Persia, but with a distinct Turkish character. As in Persia, Chinese porcelain was avidly collected by the Ottoman court, and represented another important influence, mainly on decoration. Ottoman miniature and Ottoman illumination cover the figurative and non-figurative elements of the decoration of manuscripts, which tend to be treated as distinct genres, though often united in the same manuscript and page. The reign of the Ottomans in the 16th and early 17th centuries introduced the Turkish form of Islamic calligraphy. This art form reached the height of its popularity during the reign of Suleiman the Magnificent. As decorative as it was communicative, Diwani was distinguished by the complexity of the line within the letter and the close juxtaposition of the letters within the word. The hilya is an illuminated sheet with Islamic calligraphy of a description of the Prophet Muhammad. The tughra is an elaborately stylized formal signature of the sultan, which like the hilya performed some of the functions of portraits in Christian Europe. Book covers were also elaborately decorated. Other important media were in the applied or decorative arts rather than figurative work. Other Turkish art ranges from metalwork, carved woodwork and furniture with elaborate inlays to traditional Ebru or paper marbling. In the 18th and 19th centuries Turkish art and architecture became more heavily influenced by contemporary European styles, leading to over-elaborated and fussy detail in decoration. European-style painting was slow to be adopted, with Osman Hamdi Bey for long a somewhat solitary figure. He was a member of the Ottoman administrative elite who trained in Paris, and painted throughout his long career as a senior administrator and curator in Turkey. Many of his works represent Orientalism from the inside, as it were. A transition from Islamic artistic traditions under the Ottoman Empire to a more secular, Western orientation has taken place in Turkey. Modern Turkish painters are striving to find their own art forms, free from Western influence. Sculpture is less developed, and public monuments are usually heroic representations of Ataturk and events from the war of independence. Literature is considered the most advanced of contemporary Turkish arts.