Guo Xi and Guo Si were father-son artists during the Northern Song dynasty. The younger Guo, Guo Si, complied with his father's theories forming an important treatise on landscape painting. Guo Xi proposed that landscape paintings with mountains had to have three distances – "high distance," "deep distance," and "level distance." These all represented different views and perspectives of the mountains to develop a more lifelike image.

• Painting