The uncanny valley is a hypothesis in the field of aesthetics which holds that when features look and move almost, but not exactly, like natural beings, it causes a response of revulsionamong some observers. The "valley" refers to the dip in a graph of the comfort level of beings as subjects move toward a healthy, natural likeness described in a function of a subject's aesthetic acceptability. Examples can be found in the fields of robotics[2] and 3D computer animation,[3][4] among others.
A number of films that use computer-generated imagery to show characters have been described by reviewers as giving a feeling of revulsion or "creepiness" as a result of the characters looking too realistic.
Several reviewers of the 2004 animated film The Polar Express called its animation eerie. CNN.com reviewer Paul Clinton wrote, "Those human characters in the film come across as downright... well, creepy. So The Polar Express is at best disconcerting, and at worst, a wee bit horrifying." [44] The term "eerie" was used by reviewers Kurt Loder[45] and Manohla Dargis,[46] among others. Newsday reviewer John Anderson called the film's characters "creepy" and "dead-eyed", and wrote that "The Polar Express is a zombie train." [47] Animation director Ward Jenkins wrote an online analysis describing how changes to the Polar Express characters' appearance, especially to their eyes and eyebrows, could have avoided what he considered a feeling of deadness in their faces.
http://en.wikipedia.org/wiki/Uncanny_valley
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