  According to non-reductive realism, by contrast, paradigmatic relations are to be identified not with ordinary, non-relational accidents, but rather with accidents of a sui generis type. Thus, if Simmias is taller than Socrates, this is to be explained by appealing to a pair of sui generis accidents that are distinct from, but nonetheless necessitated by, Simmias’s and Socrates’s heights. Again, Socrates’s similarity to Theaetetus is to be explained not by their respective colors, but by a pair of sui generis accidents necessitated by them. And so on for the relations involved in other paradigmatic relational situations.