Wikipedia
Bianhua
Bianhua meaning "transformation; metamorphosis" was a keyword in both Daoism and Chinese Buddhism. Daoists used bianhua describing things transforming from one type to another, such as from a caterpillar to a butterfly. Buddhist translators used bianhua for Sanskrit nirmāṇa "manifest through transformations", such as the nirmāṇa-kaya "transformation body" of a Buddha's reincarnations.