It was a vibrancy and energy that, to you, represented life itself. Now you come across a creature that completely lacked that. It had no such aura of emotion. Indeed, he seemed very much to not even be alive in your eyes because of this. Yet he walked, he talked, he joked and laughed. So you convince yourself that, somehow, he is mimicking these feelings, like an intricately well-crafted magical golem. An automaton of some sort, natural or otherwise, a mockery of intelligent life. Either that or he was hiding it somehow, which only changelings knew how to do, and even then it was imperfect. The creature was, in a very real sense, wrong.