Economic reform in the 1980s, bringing with it increased general affluence, has promoted a revival of interest in antiques and collecting. Antique porcelain sold by auction houses fetch ever-higher prices, and this has stimulated demand for reproduction ware as well. The sheer variety of reproduction ceramics available has reached a historical record, with every style copied, from the colorful pottery of the Neolithic age to porcelain produced in the republican period. The most frequently seen examples replicate the celadon of the Six Dynasties, the Lushan porcelain of the Tang dynasty, the tricolor glazed earthenware of the Tang dynasty, the celadon from the kilns of Yaozhou, Cizhou, Jianyao and Jizhou in the Song dynasty, the shadowy blue porcelain from Jingdezhen, the porcelain produced in the kilns of Ruyao, Guanyao, Geyao, Dingyao and Junyao in the Song dynasty, the porcelain of the Liao dynasty, the porcelain from the Dehua kiln in the Ming dynasty and the porcelain produced in Jingdezhen in the Yuan, Ming and Qing dynasties.