Perhaps the most innovative and advanced aspect of Amy was the construction of a single mechanical head that was able to perform all but one of the character's facial functions. In the character effects field, it was typical to build multiple heads to perform a wide range of actions, since a single head did not provide sufficient room to fit all of the mechanisms required to execute that range of actions. Another problem was foam rubber's inability to stretch and contract like real skin as the head went through different facial expressions. Because of those limitations, Stan Winston's crew, and other effects practitioners had sculpted more extreme expressions into separate heads, exchanging a neutral hero head with these extreme-expression heads as needed.

Film

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