One of the main points of the theory to explain this is that people are not as affected in an emotional way by the object if it is easy to tell it is not human. After a certain point, people start to feel emotionally about it, but feel negatively because it is so nonhuman. As it gets closer to looking human, they start to feel more positive emotions towards it. A graph of these feeling shows a valley. This is part of the reason for the naming of the theory.