Stathis Psillos explores a fundamental ontological puzzle pertaining to powers, in the editors’ opinion perhaps the most fundamental one, namely the internal coherence of their dual nature. On the one hand, powers are intrinsic properties of their objects. They are really and truly predicated of their subjects because they are, strictly speaking, constituents of their subjects. Thus their beings are tied to their objects in a way that makes the rest of the world irrelevant for them, and this way is typically characterized through a counterfactual: even if everything else in the world were different, or if nothing else existed in the world, object X would possess any and all powers Φ that it now possesses in the actual world. But, on the other hand, powers are also directed toward their manifestations. This notion of directed is somewhat vague and difficult to nail down, but at the very least it prima facie implies that powers in some important way depend on something external to them and their object. The implication and its externality are crystal clear in most cases: an active/passive power requires the existence of its co-relative as a necessary condition for that power’s ever being manifested. And insofar as the existence of a power depends on the possibility of its being manifested, the existence of any power Φ now seems to require the existence of its co-relatives and, consequently, the bearers of those co-relatives.