The Spiderwick Chronicles (2008)

96 min - Adventure, Family, Fantasy
Upon moving into the run-down Spiderwick Estate with their mother, twin brothers Jared and Simon Grace, along with their sister Mallory, find themselves pulled into an alternate world full of faeries and other creatures.
Director: Mark Waters
Writers: Karey Kirkpatrick, David Berenbaum
Stars: Freddie Highmore, Sarah Bolger, David Strathairn, Mary-Louise Parker
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The Na'vi language was created entirely from scratch by linguist Paul Frommer, who was hired by James Cameron to construct a language that was easily pronounceable by the actors, but lacking any resemblance or influence from any single human language. Around 500 words were created.
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