"Gong Sun Long Zi" "On Name & thing" is generally divided into two parts. The theme of the first half of ONT ("On Name & thing") is 'thing, filling-up(matter), position' & 'rectification of names'. The second half explains 'that-this', 'answer-call' 'activate, correspond, stop, exist'. The first part of ONT deals with the thing-matter, the second part treats names. There are things(物) within the sky & earth (canopy sky theory). Thing(物) is a existence. Existence is filled up(實). The filled-up has a position(位). Thing-matter(filled-up)-position is a individual. It is right (正) that name corresponds to thing. Corresponding is the rectification of name(正名). ONT corresponds individual to name. Thus ONT presents 'that-this' (demonstrative pronoun) as the example of name. If 'that-this' corresponds(當) to 'thing-matter-position' correctly, speech act of 'answer-call'(唯謂) can be activated. (行) Thing stays-exists(止·存) on its position, it can be in accordance with name, and answer-call can be performed. ONT regards 'exist' as 'be'(copula). ONT considers that the correspond of individual to 'that-this' is the accordance of name & matter(名實). It is a theory that deny the common nouns. It is a extension of "On Hardness and Whiteness", "On the White Horse", "On Pointing at Things" which deny the substance, and only accept the attribute. The common nouns stand on the substance, but the attributes are perceived. The perceived corresponds to individuals. ONT argues the relation of name & matter(名實) by 'that-this' demonstrative pronouns. But "Understanding the Change"(UC) begins with 'left-right', and enlarges the arguments to 'cow-sheep, horse, hen', 'blue-white, yellow, cobalt blue'. That-this, left-right are a demonstrative pronouns, whereas cow-sheep, blue-white are a common nouns. "Understanding the Change" goes the way to denying a common nouns. In this regard, ONT is the prelude to "Understanding the Change".