Avatar (2009 film) themselves to change into a Na'vi. "Avatar: A Confidential Report on the Biological and Social History of Pandora", a 224-page book in the form of a field guide to the film's fictional setting of the planet of Pandora, was released by Harper Entertainment on , 2009. It is presented as a compilation of data collected by the humans about Pandora and the life on it, written by Maria Wilhelm and Dirk Mathison. HarperFestival also released Wilhelm's 48-page "James Cameron's Avatar: The Reusable Scrapbook" for children. "The Art of Avatar" was released on , 2009, by Abrams Books. The book features
Avatar (2009 film) it. The "Avatar" Three-Disc Extended Collector's Edition on DVD and Blu-ray was released on , 2010. Three different versions of the film are present on the discs: the original theatrical cut, the special edition cut, and a collector's extended cut (with the DVD set spreading them on two discs, but the Blu-ray set presenting them on a single disc). The collector's extended cut contains 6 more minutes of footage, thus making it 16 minutes longer than the original theatrical cut. Cameron mentioned, "you can sit down, and in a continuous screening of the film, watch it with the Earth opening".