 Minimality  entails that if a binary relation \(R\) is perfectly natural, its converse—being an \(x\) and \(y\) such that \(R(y,x)\)—is not also perfectly natural. This seems oddly arbitrary: it is tempting to think that, instead, converse relations are always equally natural. One could avoid this objection by weakening  Minimality,  replacing ‘distinct from \(R\)’ with ‘distinct from \(R\) and its converse’, or more generally ‘distinct from all of the permutations of \(R\)’. More ambitiously, one could develop a theory of “neutral” relations (Fine  2000),  understood as entities for which distinctions like the one between a relation and its converse does not arise, and treat ‘perfectly natural’ as a predicate of neutral relations.