In the Neolithic age, Dawenkou Culture. The height is 12.2 cm, the caliber is 8.6 cm, and the bottom diameter is 6.5 cm. It was unearthed at Dawenkou site in Tai'an, Shandong Province in 1959. Water heater. Clay red pottery, straight neck, flat and round, with flat bottom under the abdomen, two convex buttons on the shoulder, polished surface and painted with red pottery clothes, and the abdomen is decorated with black ground and white color vortex belt for a week.