Thus it can be only after one has recognised, not without having had to feel one's way, the optical illusions of one's first impression that one can arrive at an exact knowledge of another person, supposing such knowledge to be ever possible. But it is not; for while our original impression of him undergoes correction, the person himself, not beings an inanimate object, changes in himself, we think that we have caught him, he moves, and, when we imagine that at last we are seeing him clearly, it is only the old impressions which we had already formed of him that we have succeeded in making clearer, when they no longer represent him.