Around 5500 BC a distinctive style of pottery spread across the whole of northern Mesopotamia. They were made by hand (the potter's wheel had not yet been invented) and decorated with very fine geometric designs in one or two colours. The painted pottery was then fired, and generally to a high standard.It is not yet understood how this style spread over such an enormous area. It was made locally in many places, but may also have been exchanged because of its beauty and prestige value. Perhaps itinerant potters may have moved across the region producing examples and starting a fashion in different areas.The high quality of the firing means that many examples of Halaf pottery have survived and have been found by archaeologists. This plate, typical example of the Halaf style, comes from Arpachiyah in northern Mesopotamia, one of the most important sites for understanding the period and its pottery. Arpachiyah was excavated by Max Mallowan in 1933.