The trait of the genre of horror is that it provokes a response, emotional, psychological or physical within each individual that causes someone to react with fear. In order for that response to be elicited there are different techniques used, such as unreal figures (phantoms, mummies, etc.), or more real situations and figures (serial killers). The whole horror genre is built up upon people's fear of the unknown and anxieties. According to H.P. Lovecraft, "The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown."