Literature Reference: 紫洞藏仙窟，玄泉贮怪湫。—— 《想东游五十韵》 The purple grotto hides a fairy cave, the mysterious spring stores strange whirlpools. Source from 'Thinking of Traveling East'.
紫: Represents a person of authority and prestige.
洞:
Meaning: The purple grotto symbolizes a mystical cave hiding fairies, representing depth, mystery, and transcendence.