 A third approach, competing with skepticism and relativism, is Epicurean epistemology. Again, the set of phenomena to be accounted for is the same. But it is described differently. Epicurus insists that we should not even speak of conflicting appearances. Rather, we should speak of different perceptions. Perceptions cannot refute each other, because they are of the same weight. Epicurus here uses the term that is central to Pyrrhonism: equal weight, isostheneia (DL 10.31–2). The fact that perceptions differ has perfectly reasonable explanations: I look from a distance, you look from nearby; I have a cold, you are healthy; I am a human being, another cognizer is a dog; and so on. These facts figure in the explanations of how our perceptions are constituted. Accordingly, Epicurus argues, all perceptions, even though they differ, are true. They all have a causal history that physics can explain. The precise interpretation of this proposal is controversial. One might object that the notion of truth employed here is deeply puzzling. It is not clear what it means to describe all perceptions as true if they cannot be true or false.