The evil clown archetype plays strongly off the sense of dislike it caused to inherent elements of coulrophobia; however, it has been suggested by Joseph Durwin that the concept of evil clowns has an independent position in popular culture, arguing that "the concept of evil clowns and the widespread hostility it induces is a cultural phenomenon which transcends just the phobia alone". A study by the University of Sheffield concluded "that clowns are universally disliked by children. Some found them quite frightening and unknowable. " This may be because of the nature of clowns' makeup hiding their faces, making them potential threats in disguise; as a psychology professor at California State University, Northridge stated, young children are "very reactive to a familiar body type with an unfamiliar face". This natural dislike of clowns makes them effective in a literary or fictional context, as the antagonistic threat perceived in clowns is desirable in a villainous character.