Literature Reference: It is also heard that the Han Emperor personally wrote verses, and it is fitting to present the 'Zi Xu' with ease. Source from 'Zeng Hongwen Du Xiaoshu'.
子: Descendants, offspring. It also refers to the favored children of heaven, those who are learned and virtuous.
虚: Illusion. Idleness. Vanity.
Meaning: Zi Xu refers to fictional things, symbolizing transcendence from the mundane and the pursuit of spiritual freedom.