Enter the world of OSGEMEOS, the Brazilian twins driving international graffiti culture. Contemporary art is sometimes considered an austere matter: ascetic in palette, serious in tone, a subject for sober contemplation. That stereotype is exploded--ecstatically, and in full color--by the work of OSGEMEOS, trailblazing twin Brazilian artists with a practice as firmly rooted in the rule-breaking world of urban graffiti as it is in the...