Graffiti it is a rapidly developing art form whose value is highly contested and reviled by many authorities while also subject to protection, sometimes within the same jurisdiction. Both "graffiti" and its occasional singular form "graffito" are from the Italian word "graffiato" ("scratched"). "Graffiti" is applied in art history to works of art produced by scratching a design into a surface. A related term is "sgraffito", which involves scratching through one layer of pigment to reveal another beneath it. This technique was primarily used by potters who would glaze their wares and then scratch a design into it. In ancient times
Graffiti the most uneven distributions of income. Laws and taxes change frequently." Such factors, Manco argues, contribute to a very fluid society, riven with those economic divisions and social tensions that underpin and feed the "folkloric vandalism and an urban sport for the disenfranchised," that is South American graffiti art. Prominent Brazilian graffiti artists include Os Gêmeos, Boleta, Nunca, Nina, Speto, Tikka, and T.Freak. Their artistic success and involvement in commercial design ventures has highlighted divisions within the Brazilian graffiti community between adherents of the cruder transgressive form of "pichação" and the more conventionally artistic values of the practitioners of "grafite".