Alessandra and her son Riquelme pose in front of graffiti in the Vila Flavia favela of Sao Paulo
Alessandra, 24, and her son Riquelme, 4, pose in front of graffiti painted by Brazilian artists working with OPNI, an organization that uses graffiti to improve life in the slums, in the Vila Flavia favela of Sao Paulo August 26, 2011. OPNI, a Portuguese acronym which means "Unidentified Graffiti Artists", was formed in 1997 by some 20 youths in Sao Paulo's marginal slums with the goal of transforming the streets into an open-air gallery where the community can express its gripes and denounce social injustices. With only three of the original founding members left after most were either arrested, abandoned the activity to do something else, or died from drug abuse, OPNI offers workshops in art, capoeira dance, and graffiti to the community. Their current project is called "Favela Graffitada" and the organization has extended invitations to national and international artists to create over 100 graffiti works throughout the favela. Picture taken August 26, 2011. REUTERS/Nacho Doce (BRAZIL - Tags: SOCIETY TPX IMAGES OF THE DAY)