The image is a photograph of a plaque on a wall. The plaque is rectangular in shape and has a beige background with black text written in Chinese characters. The text is written in a traditional Chinese font and is centered on the plaque. Below the text, there is a list of the names of different types of porcelain, including Northern variegated-glazed porcelains of the Tang period, called huayou, which is a glaze which sets splashes of sky-blue or moon-white on a black, yellowish-brown, or yellow ground. The sharp contrast has a vivid and spontaneous effect. The best and most famous examples were made at Lushan and Jianxian in Henan province, but similar wares came from Yuxian and Neixiang in Henans province, Jiaocheng in Shanxi province, and Tongchuan in Shaanxi province.