Literary-Devises.com defines Mortif as: any element, subject, idea or concept that is constantly present through the entire body of literature. Using a motif refers to the repetition of a specific theme dominating the literary work. Motifs are very noticeable and play a significant role in defining the nature of the story, the course of events and the very fabric of the literary piece. The Black Spot is a mortif invented by Robert Louis Stevenson for his novel Treasure Island. In the book, pirates are presented with a "black spot" to officially pronounce a verdict of guilt or judgment.