Literature Reference: 境空宜入梦，藤古不留春。—— 《夏与熊王二秀才同宿僧院》 Empty surroundings are suitable for entering dreams, ancient vines do not retain spring. Source from 'Xia Yu Xiong Wang Er Xiucai Tong Su Seng Yuan'.
境: Border, the frontier of a nation.
空: The heavens, the expanse.
Meaning: Empty surroundings signify a tranquil and detached state of mind, suitable for entering dreams, symbolizing peace and transcendence.