Although admired as an artist during his own time and beyond, Jing Hao achieved his greatest fame as a theoretician, and it was during his seclusion in the
Taihang that Jing Hao produced what is perhaps his most lasting contribution to
Chinese arts, a treatise on painting humbly titled
Bifa Ji (筆法記 “Notes on Brushwork”), which would provide the theoretical basis of the
Northern Song school for more than a century to come. In
Bifa Ji, which is written as a narrative, Jing Hao's theories on art are presented in a fictional conversation he has with an old man he meets on a road while wandering in the mountains. The old man, a sage, gives the artist a lecture, in which he describes six underlying essentials of painting: the first is
vital energy (
qi 氣), the second
rhythm, the third
thought, the fourth
scenery, the fifth
brush, and finally the sixth,
ink. Art historians have pointed out that these are almost certainly intended as a counterargument to the “six principles” of the famous pre-
Tang theoretician
Xie He, which emphasized the technical basics of painting—brush strokes and the application of color. Jing Hao provides a more logical and analytical approach, by first establishing abstract concepts such as thought and rhythm and then proceeding, from those, to practical application. After describing each of the six essentials in turn, the sage then takes a further step which will lay the foundation for the
Northern Song school, by creating a distinction between
hua (“likeness”, conveying the outward appearance of a thing) and
shi (“substance”, conveying the inherent nature of a thing). He insists that the type of brushstroke used in a painting must correspond to the inner nature of the object being depicted—for example, rocks must be painted with broad, hard brush strokes, flowers with delicate, thin brush strokes, etc. In
Bifa Ji, Jing argues that an artist must strive to find a delicate balance between communicating the physical resemblance of an object, and conveying the emotional character it possesses—or, in the words of historian
Michael Sullivan, an artist must strive for harmony between
form and
spirit. The search for such a balance between the real and the abstract would form the basis of
Chinese art criticism for centuries to come. ==Influence on later artists==