 The fourth theme, the dimensionless (wu hou, literally “lacking thickness”), is more obscure, mentioned only once in the Xunzi and once in the Annals of Lü Buwei. The dimensionless probably refers to a geometric point. According to the Mohists, the dimensionless does not “fill” anything (A65). A starting point (duan) is the dimensionless tip of a solid object (A61). Allusions to the disputers sometimes contrast the dimensionless with “the dimensioned” (you hou, “having thickness”), which the Mohists explain as having something it is bigger than (A55). The dimensionless is probably associated with the disputers because of Hui Shi’s paradox that “The dimensionless cannot be accumulated, yet its size is a thousand miles.” (Points cannot be accumulated, yet a great girth or length is the sum of the points that constitute it.) In passages referring to the disputers and their sophistries, “the dimensionless” probably alludes to any paradox arising from the concept of a geometric point or an infinitesimal. 