In the Song Dynasty, poetry was marked by a lyric poetry known as Ci (詞) which expressed feelings of desire, often in an adopted persona. Also in the Song dynasty, paintings of more subtle expression of landscapes appeared, with blurred outlines and mountain contours which conveyed distance through an impressionistic treatment of natural phenomena. It was during this period that in painting, emphasis was placed on spiritual rather than emotional elements, as in the previous period. Kunqu, the oldest extant form of Chinese opera developed during the Song Dynasty in Kunshan, near present-day Shanghai. In the Yuan dynasty, painting by the Chinese painter Zhao Mengfu (趙孟頫) greatly influenced later Chinese landscape painting, and the Yuan dynasty opera became a variant of Chinese opera which continues today as Cantonese opera.