Dependent Entities
I just realized that I have inconsistent attitudes towards ontologically dependent entities, that is, entities x such that for some contingently existing entity y, i) necessarily, if x exists so does y, and ii) x and y are not parts or subsets or elements of each other. On the one hand, I don't believe that there are many such entities, except perhaps holes and borders. On the other hand, I also don't believe in general restrictions on the counterpart relation, or, perhaps equivalently, in restrictions on cross-world fusions of individuals. It follows that for any old property any world-bound thing has at our world, there is a thing which has this property essentially. For instance, there is somebody who leads exactly your life but who, unlike you, is essentially such that the cup in front of me is now empty. This somebody is a dependent entity: it can only exist if my cup does.
The other hand seems so obvious to me that I fear I must give up the one hand: there are lots of dependent entities. I can still say that they are not ordinary things, and that it is very hard or even impossible to refer to most of them (individually, of course -- I just managed to refer to them collectively). But still they exist. Hm.