 Green also thinks the Kantian dualism is unnecessary. The idealist can explain error. We can never have access to things-in-themselves. But we can have access to other appearances that, in various ways, might represent a particular appearance as anomalous. Here, we check one appearance by appeal to others (PE §§12–13, 64). On this view, we can distinguish between individual appearances or clusters of experiences and reality but not between reality and the entire system of appearances entertained by a particular mind (PE §13). We avoid answering the question how our conceptions of the world come to match a world that is independent of them by identifying reality and objectivity with the way it is conceived holistically by a self-conscious mind (PE §§10, 13, 36–37, 63).