Bagua diagram by Zhao Huiqian ("River Chart spontaneously by Heaven and Earth" 圖河.自地天). This image may in fact be a reproduction of the diagram by Hu Wei in his "Yitu mingbian" ("Clarification of the diagrams in the book of changes"), dated 1706. Reproduced in: *François Louis, 'The Genesis of an Icon: The "Taiji" Diagram's Early History', Harvard Journal of Asiatic Studies 63.11 (June 2003), p. 171. *Joseph A. Adler, Reconstructing the Confucian Dao: Zhu Xi's Appropriation of Zhou Dunyi, SUNY Press, 2014, p. 158