The colors of classics, history, philosophy and belles-lettres were selected according to spring, summer, autumn and winter seasons, which were green, red, white or light blue and grayish black.
经、史、子、集四部颜色依春、夏、秋、冬四季而定，分别是绿色、红色、白色（或浅蓝色）、灰黑色。
2
Her essays are known as the real belles-lettres have received a lot of praise with create a separate school.