Bronze Age
Bronze Age cultures differed in their development of the first writing. According to archaeological evidence, cultures in Mesopotamia (cuneiform script) and Egypt (hieroglyphs) developed the earliest viable writing systems.
The overall period is characterized by widespread use of bronze, though the place and time of the introduction and development of bronze technology were not universally synchronous. Human-made tin bronze technology requires set production techniques. Tin must be mined (mainly as the tin ore cassiterite) and smelted separately, then added to molten copper to make bronze alloy. The Bronze Age was a time of extensive use of metals and of developing trade networks (See "Tin sources and trade in ancient times"). A 2013 report suggests that the earliest tin-alloy bronze dates to the mid-5th millennium BC in a Vinča culture site in Pločnik (Serbia), although this culture is not conventionally considered part of the Bronze Age. The dating of the foil has been disputed.
Art of Mesopotamia
The Protoliterate, or Uruk period, named after the city of Uruk in southern Mesopotamia, (ca. 4000 to 3100 BC) existed from the protohistoric Chalcolithic to Early Bronze Age period, following the Ubaid period and succeeded by the Jemdet Nasr period generally dated to 3100–2900 BC. It saw the emergence of urban life in Mesopotamia, the beginnings of Sumerian civilization, and also the first "great creative age" of Mesopotamian art. Slightly earlier, the northern city of Tell Brak, today in Syria, also saw urbanization, and the development of a temple with regional significance. This is called the Eye Temple after the many "eye idols", in fact votive offerings, found there, a type distinctive to this site. The stone Tell Brak Head, 7 inches high, shows a simplified face; similar heads are in gypsum. These were evidently fitted to bodies that have not survived, probably of wood. Like temples further south, the Eye Temple was decorated with cone mosaics made up of clay cylinders some four inches long, differently coloured to create simple patterns.