Historically, horror has been a persistently favourite genre across a variety of artistic media. Since at least the eighteenth-century, with the rise of the gothic novel, horror has had a permanent place in literary fiction.
Macbeth kills young Seyward on the field of battle, and Shakespeare gives us no stage direction telling us when or how to dispose of the body. If he has left us suggestions of any kind, they must reside entirely in dialogue that does not openly solve the problem or in stage directions that seem not to address it.
Every literary movement has its catalogue of themes to express aesthetic or philosophical tenets and to enhance the perception of its historical uniqueness. Symbolism, which rejected the stringent rules of the scientific approach to literature favoured by naturalism, devoted itself to the study of mathematically and accurately constructed world model on the other side of the mirror.