human will ever fully grasp the concept. Scholar Hu Jun writes, “What is required in order to grasp matter [Stuff] is a sort of intellectual projection, in which recognition of the limits of one’s intellect is accompanied by a leave out of the intellectual process...”. Stuff is the capacity of all things to change – pure activity and potentiality. It is composed of two categories – Universals and Possibilities. Universals and possibilities Jin explains the notions of Universals and Possibilities as stemming from the ideal version of concepts, which in turn stems from abstracting the concrete. The Universal is a concept which a group of things have in common. Jin writes, “Each universal is an aspect shared by a class of objects, for example… horseness which is shared by a class of quadrupeds”. Universals are groupings that we are familiar with. A Possibility, therefore, is a concept that is not a Universal. It is that which has not been imagined yet, but could be imagined. Thus, Jin writes, “we are able to define an universal as a realized possibility… A universal is merely a Stuffed possibility”. Jin posits that the reality we feel with regard to events and objects is the realization of possibilities of those events and objects. Hu writes, “The realization of contingent possibilities gives us the richness, variety, and completeness of Tao, whereas the eternally unrealized possibilities supply us with the implements in the realm of thinking and thought”. Form Form is what Stuff must remain inside of. Hu writes, “Whether or not matter [Stuff] enters into or withdraws from possibilities, it must stay within Form”. Everything is inside of Form. Jin explains that unlike Universals, it does not have “a boundary line dividing what belongs to it from what doesn’t”. Thus Form is formless – it incorporates everything and is nothing at the same time. It is what is left when there are no possibilities – there is nothing outside of Form. Form and Stuff are inescapably intertwined. Stuff fills Form, and Form contains Stuff. Jin writes, “Un-Stuffed Form or Un-formed Stuff is a contradiction”. Jin defines their relationship as, “Stuff as a sort of raw material and Form as a kind of mould”. Tao Tao is Jin's most basic concept, but is also his highest ideal realm. Tao is the coming together of Stuff and Form to create the universe. If Tao were only Stuff