An archaeologist arranges tiles at the ruins of a government office building, which was believed to be a musical department of the Qin Dynasty (221-207 B.C.), in northwest China's Shaanxi Province, Jan. 24, 2018. The ruins, 110 meters long and 19.5 meters wide, were composed of four rooms of equal area, with clay walls of around 3 meters thick, said Zhang Yanglizheng, assistant researcher with the provincial research institute of archaeology. In addition to architecture materials, such as tiles and bricks, pieces of stone chimes, a percussion instrument in ancient China, were found in the ruins excavated in Xixian New Area. (Xinhua/Li Yibo)