Bagua diagram from Zhao Huiqian's (趙撝謙) Liushu benyi (六書本義, 1370s).
Much of the Chinese symbolism behind the Bagua has been misinterpreted so be sure to discern the information provided in this link. However those who understand the truths encoded within these symbols will be able to find a few pearls of wisdom here. https://en.wikipedia.org/wiki/Bagua