There is an interesting theory about the structure of the mystical mountain, Penglai(#蓬萊) being a pot.
In WangJia(王嘉)’s ‘Records of the Unearthed Tales《拾遺記》’, Penglai ‘s structure is described as resembling a pot, alongside two other mystical mountains, Fangzheng and Yingzhou. These three, collectively termed the ‘Three Pots(三壺) ‘. The Three Pots symbolize three sea-bound mountains. Fanghu(方壺) represents Fangzhang(方丈), Ponghu(蓬壺) signifies Penglai(蓬萊), and Yinghu(瀛壺) embodies Yingzhou(瀛洲), all shaped akin to vessels.
This pot-like imagery signifies a contained world, each potentially holding its own universe within.
三壺則海中三山也，一曰方壺，則方丈也，二曰蓬壺，則蓬萊也，三曰瀛壺，則瀛洲也，形如壺器。
🎨 袁耀, 《蓬萊仙境》, in the Qing Dynasty