In most cases adaptation, the films are required to create identities (for example, a characters' costume or set decor) since they are not specified in the original material. Then, the influence of film-makers may go unrecognized because there is no comparison in the original material even though the new visual identities will affect narrative interpretation. Peter Jackson's adaptations of "The Lord of the Rings" trilogy and "The Hobbit" by author JRR Tolkien represent an unusual case since many visual and stylistic details were specified by Tolkien. For the "Harry Potter" film series, author JK Rowling was closely consulted by the filmmakers, and she provided production designer Stuart Craig with a map of Hogwarts' grounds and also prevented director Alfonso Cuarón from adding a graveyard scene because the graveyard would appear elsewhere in a later novel.