 The tenth and final chapter of Treatise on the Five Teachings of Huayan (Ch. Huayan Wujiao Zhang; T45.1866, trans. Cook 1970) contains many of Fazang’s most distinctive and important doctrines. In the first section, Fazang develops his theory of the three natures. The original theory was developed in Yogacara Buddhism, and posits three “realities”: first, that there is nothing but ineffable, inexpressible reality that resembles space, gold, and water in its absolute natural purity; second, that this reality appears as an unreal imaginative construction; and third, that this unreal construction is the basis for error, which arises through confusing the construction for reality. 