  A further question surrounds the formulation of Protagoras’s own view.  In Metaphysics IV 6, Aristotle explains how a Protagorean PNC-skeptic ought to present his view so as to avoid violating PNC: “those who seek to be compelled by argument, and at the same time demand to be called to account for their views, must guard themselves by saying that the truth is not that what appears exists, but that what appears exists for him to whom it appears, and when, and to the senses to which, and under the conditions under which it appears.” Otherwise, they will find themselves contradicting themselves (Metaph IV 6 1011a20–25). However, Aristotle still finds fault with this view because it makes everything relative to perception, including the perceiver. Not everything can be relative to perception, according to Aristotle. As he explains at the end of the previous chapter, there is something beyond perception that causes the perception and is prior. Aristotle uses his discussion of PNC and Protagoras to stake out a realist position.