Literary works of "mixed" genre are occasionally termed grotesque, as are "low" or non-literary genres such as pantomime and farce. Gothic writings often have grotesque components in terms of character, style and location. In other cases, the environment described may be grotesque - whether urban (Charles Dickens), or the literature of the American south which has sometimes been termed "Southern Gothic". Sometimes the grotesque in literature has been explored in terms of social and cultural formations such as the carnival(-esque) in François Rabelais and Mikhail Bakhtin. Terry Castle has written on the relationship between metamorphosis, literary writings and masquerade.