An influential Chinese philosopher who lived around the 4th century BC during the Warring States Period, a period corresponding to the philosophical summit of Chinese thought — the Hundred Schools of Thought. Zhuangzi is most important Taoist after Lao Tzu who stressed the equality of opposites and the danger of usefulness. His name is sometimes spelled as Zhuang Tze, Zhuang Zhou, Chuang Tsu, Chuang Tzu, Chouang-Dsi, Chuang Tse, or Chuangtze.