Chen Tʾuan

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Ch'en Tʾuan (10th cent. CE). Taoist scholar of both outer and inner alchemy, who lived on Mount Hua-shan as a hermit. On the face of the rock he carved the diagram of the supreme emptying, (wu-ch'i-tu). He is also reputed to have originated the other diagram of great importance to neo-Confucians, the diagram of the immortal heaven (hsien-t'ien-tu).