 To represent something as another “I” is to represent it as a possible target of self-projection: as something one might (with varying degrees of success) imaginatively put oneself in the place of. (Of course, one can fancifully put oneself in the place of just about anything—a suspension bridge, even; but that is not a reductio ad absurdum, because one can also fancifully represent just about anything as having a mind.) 