In this March 27, 2013 photo, a girl walks by a wall covered by four murals by artists, from left, Anita Messina and Emy Mariani; El Marian; Mati Quiroga; and Lucio Savant in the Barracas neighborhood of Buenos Aires, Argentina. The urban artists generally go door to door seeking approval from building owners before starting a mural. Owners usually agree, especially if the mural of aerosol, acrylic or oil paint will cover up political slogans and other graffiti already painted there. (AP Photo/Natacha Pisarenko)

Associated Press
In this March 27, 2013 photo, a girl walks by a wall covered by four murals by artists, from left, Anita Messina and Emy Mariani; El Marian; Mati Quiroga; and Lucio Savant in the Barracas neighborhood of Buenos Aires, Argentina. The urban artists generally go door to door seeking approval from building owners before starting a mural. Owners usually agree, especially if the mural of aerosol, acrylic or oil paint will cover up political slogans and other graffiti already painted there. (AP Photo/Natacha Pisarenko)
In this March 27, 2013 photo, a girl walks by a wall covered by four murals by artists, from left, Anita Messina and Emy Mariani; El Marian; Mati Quiroga; and Lucio Savant in the Barracas neighborhood of Buenos Aires, Argentina. The urban artists generally go door to door seeking approval from building owners before starting a mural. Owners usually agree, especially if the mural of aerosol, acrylic or oil paint will cover up political slogans and other graffiti already painted there. (AP Photo/Natacha Pisarenko)
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