Ink wash painting is a type of Chinese ink brush painting which uses washes of black ink, such as that used in East Asian calligraphy, in different concentrations. It emerged during the Tang dynasty of China (618–907), and overturned earlier, more realistic techniques. It is typically monochrome, using only shades of black, with a great emphasis on virtuoso brushwork and conveying the perceived "spirit" or "essence" of a subject over direct imitation. Ink wash painting flourished from the Song dynasty in China (960–1279) onwards, as well as in Japan after it was introduced by Zen Buddhist monks in the 14th century. Some Western scholars divide Chinese painting into three periods: times of representation, times of expression, and historical Oriental art. Chinese scholars have their own views which may be different; they believe that contemporary Chinese ink wash paintings are the pluralistic continuation of multiple historical traditions.