The uncanny valley is a psychological theory about the effect involving art and robots and human emotions. As something starts to look more human-like, there is a point at which people start to feel it looks wrong. At this point, they have negative feelings toward the object. These feelings keep getting worse as the object is made to look more human-like. At a certain point, as the object starts to get very close to looking human-like, how people feel towards it tend to reverse and they have more positive emotional feelings towards it. The theory was created by the robotics professor Masahiro Mori in 1970.