  The rejection of polyadic properties might seem to commit one to a form of anti-realism about relations—that is, to the view that relations exist only in the mind. This was, in fact, the position of Peter Auriol. If there are no polyadic properties or ‘intervals’, he assumes, then there is nothing in extramental reality to correspond to our relational concepts. But in that case, he says, “a relation cannot be posited except in apprehension  alone”.[12]