Literature Reference: 数州消息断，愁坐正书空。—— 《对雪》 News from several regions is cut off, and I sit in sorrow, writing in the air. Source from 'Dui Xue'.
书: Books, repositories of knowledge, embody wisdom. They express art and literature, convey profound thoughts, facilitate emotional expression, and are adorned with literary elegance.
空: The heavens, the expanse.
Meaning: Writing in the void, expressing inner solitude and helplessness.