  What are these resemblance conditions? Sometimes the resemblance conditions include some that must be satisfied, not by the things in question (e.g. not by the scarlet things), but by things suitably related to them. For instance, in the version of Resemblance Nominalism developed in Rodriguez-Pereyra 2002, what makes scarlet things scarlet is that they resemble each other, that there is a degree of resemblance d such that no two scarlet things, and no two nth-order pairs (two-membered unordered classes) whose ur-elements are scarlet things, resemble each other to a degree less than d, and that the class of scarlet things is or fails to be included in certain other classes defined in terms of resemblance conditions like the ones just mentioned (see Rodriguez-Pereyra 2002, 156–98, for details). Of course the crimson things also resemble each other and they also meet the other conditions having to do with resemblance degrees and their class being or failing to be included in certain other classes. But this does not mean that what makes something scarlet is what makes something crimson: what makes a scarlet thing scarlet is that it resembles these things (i.e. the scarlet ones), which happen to satisfy the stated conditions having to do with resemblance degrees and their class being or failing to be included in certain other classes while what makes a crimson thing crimson is that it resembles those things (i.e. the crimson ones), which also happen to satisfy the stated conditions having to do with resemblance degrees and their class being or failing to be included in certain other classes.