The Uncanny Valley is a hypothesis developed by Japanese roboticist Masahiro Mori in 1970. The hypothesis has great implications for the depiction of photorealistic humans in CGI. He postulated that as a robot becomes more human in appearance and motion, human beings will have an increasingly positive, empathic response. However, when some point of human-like quality is reached, the response will switch to repulsion and uneasiness. Eventually though, the response will become positive once again when the robot is almost entirely human.