Literature Reference: 风气通岩穴，苔文护洞门。——《太湖石》白居易 The breeze flows through the rocky caves, and the moss patterns guard the cave entrance. Source from 'Taihu Stone' by Bai Juyi.
洞:
苔: A type of cryptogamic plant, where the distinctions between roots, stems, and leaves are not clearly defined.
Meaning: The moss in the cave symbolizes the quiet and resilient beauty of nature, embodying a low-key yet enduring vitality.