Naturalistic costume and makeup are used in psychological thrillers to make characters seem more relatable and believable to audiences despite portraying mental illness. Minimal or no makeup allows characters to appear normal. This can shock audiences by making them relate the film's plot to their own lives. Lighting, colors, and settings are also used to create suspense and unease. Low key lighting and dark settings generate fear, while contrasting lighting depicts differences between sane and insane characters. Shadows heighten the frightening effects. These techniques immerse audiences in the psychological states of the characters.