Thematic cartography involves maps of specific geographic themes, oriented toward specific audiences. Both novels cover grand themes and ideas. Various video games feature Gothic horror themes and plots. Each game also includes specific themes and motifs. There are many different themes and versions of Uno. The Golden Horn is featured in many works of literature dealing with classical themes. Tolkien felt thematically necessary in terms of characters, themes, events and subtlety. The diaries feature background information about their themes. Many variations on these general themes occur. These themes and techniques are often used together. The music itself provides a contrast to the darker themes. Mayer knew that formula in his themes and stories usually works. There were two main musical themes for the 1992 Games. Horton's music usually encompassed folk ballads based on American historic themes and legend. The main themes in Black Butler reflect that.