Causation, Explanation, and the Metaphysics of AspectWhen you light a match it is the striking of it which causes the lighting; the presence of oxygen in the room is a background condition to the lighting. But in virtue of what is the striking a cause while the presence of oxygen is a background condition? When a fragile glass breaks it manifests a disposition to break when struck; however, not everything that breaks manifests this disposition. So under what conditions does something, in breaking,