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) extracted for 2D screenings. However, a 3D 2.39:1 extract was approved for use with constant-image-height screens (i.e. screens which increase in width to display 2.39:1 films). During a 3D preview showing in Germany on , the movie's DRM 'protection' system failed, and some copies delivered could not be watched at all in the theaters. The problems were fixed in time for the public premiere. "Avatar" was released in a total of 3,457 theatres in the US, of which 2,032 theatres ran it in 3D. In total 90% of all advance ticket sales for "Avatar" were for 3D screenings. Internationally, "Avatar"