Literature Reference: 迸泉清胜雨，深洞暖如春。—— 《题大理崔少卿驸马林亭》 The gushing spring is clearer than rain, and the deep cave is as warm as spring. Source from 'Ti Dali Cui Shaoqing Fuma Linting'.
深: Profound and enlightened, symbolizing depth of understanding and intelligent wisdom.
洞:
Meaning: Deep cave symbolizes depth and tranquility, representing wisdom and introversion, as clear as a spring and warm as spring.