Polish people look at China Tang tri-colored glazed pottery at the Hieronim Lopacinski Voivodeship Public Library in Lublin, Poland on Feb. 7, 2018. A unique exhibition "Tri-colored glazed pottery of the Tang dynasty in Luoyang, China" is ongoing in Polish Eastern City of Lublin. (Xinhua/Chen Xu)

A man looks at China Tang tri-colored glazed pottery at the Hieronim Lopacinski Voivodeship Public Library in Lublin, Poland on Feb. 7, 2018. A unique exhibition "Tri-colored glazed pottery of the Tang dynasty in Luoyang, China" is ongoing in Polish eastern City of Lublin. (Xinhua/Chen Xu)