What is the author's style in Possession by A. S. Byatt?

The point of view of Possession: A Romance is constantly passed around among the main characters. The letters are the first clue of the novel, and they are written from the points of view of Christabel LaMotte and Randolph Henry Ash. Blanche Glover's letters to Ellen Ash and her suicide note provide her distinct point of view. Journal entries provide the point of view of Ellen Ash or Christabel's cousin, Sabine. Academic books are also quoted and give the points of view of Mortimer Cropper, James Blackadder, and Leonora Stern. Even the medium, Hella Lees, gives her point of view when Blackadder reads a portion of her book and it shows up in a chapter.