  In reply, a dualist could appeal to “individualistic” powers (Unger 2006, pp. 242–59; Foster 1991, pp. 167–8). Powers are standardly thought of as powers to interact with some type of object. A key has the power to open this lock, but only by virtue of having the power to open any lock of this kind, the power to open any intrinsically comparable lock. Individualistic powers, in contrast, are powers possessed by an object to affect or be affected by a particular object. Think of a key with the power to open this lock, but without the power to open any intrinsically indiscernible lock. Likewise, a soul could have the power to interact with a particular body and no other. As the key example suggests, however, it is by no means obvious that powers could be individualistic in this sense.