Daoist School of the Warring States Period (475-221 BC), based on the teachings of Laozi or Lao-tze 老子[Lao3 zi3] (c. 500 BC-) and Zhuangzi 莊子|庄子[Zhuang1 zi3] (369-286 BC)
Definitions (粵典–words.hk)
名詞
起於中國春秋時代嘅思想流派之一,又稱「道德家」;代表人物有老子、莊子,主張「道」就係清靜無為、效法自然,喺宗教(例如道教)同養生亦有連結 (philosophical) Taoism (relevant to the religious tradition 道教dou6 gaau3)
Professor Li Hui expresses that after their paper was published, it attracted the attention of traditional medicine experts. This was because vowels are thought to be related to the meridian theory of traditional medicine; the "Six-character Formula" of Taoist health maintenance states that vowel pronunciation can help clear the meridian, and the 20 vowels of Fengxianese just so happen to correspond to the 20 meridians of the human body.