滄そう海かい桑そう田でん

expression

the world is in constant flux; the blue sea turns into a mulberry field

A classical yojijukugo expressing that the world undergoes dramatic changes over time, often used in literary or philosophical contexts. The literal image is of the sea transforming into farmland.

• 滄そう海かい桑そう田でんの言こと葉ば通どおり、世よの中なかは絶たえず移うつり変かわっている。

  As the saying goes, the world is constantly changing.