A prosperous society of Song Dynasty (960-1279) made it possible for the development of literature and art. Ci poetry, originating in the Tang and written to certain tunes in fixed numbers of lines and words, was fully developed in the Song. Composing Ci poems became a common and fashionable practice among the literati. On the other hand, the Song government set up a huge imperial art academy to enlist talented and pioneering painters, who scored considerable achievements and lef behind a great amount of enduring works.