"Things change, which means the world is changeable", this poem comes from Cheng Yuansheng's "Tales of Kindergarten Learning" in Qing Dynasty. It means that the sea turns into farmland, and farmland turns into the sea. It means that things in the world have changed greatly or rapidly, and it also describes long-term changes.
"vicissitudes of life" first came from Jin Gehong's "Fairy Biography of Ma Gu": "Ma Gu has seen three mulberry fields in the East China Sea since she said that she was a cloud." Ma Gu herself said that since she came here, she has seen the East China Sea turn into farmland three times.