He ultimately died in 1977 leaving an unfinished manuscript in note card form for the novel The Original of Laura. Penguin later published the incomplete novel with in 2012 with the subtitle A Novel in Fragments. Unlike most manuscripts written or typewritten on larger paper, this one came in the form of 138 index cards. Penguin’s published version recreated these cards in full-color reproductions including the smudges, scribbles, scrawlings, strikeouts, and annotations in English, French, and Russian. Perforated, one could tear the cards out of the book and reorganize in any way they saw fit or even potentially add their own cards to finish the novel that Nabokov couldn’t.
Vladimir Nabokov famously wrote most of his works including Lolita using index cards in a slip box.