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TO GO WITH AFP STORY BY DANIEL SILVA Jose Pedro Gonzalez, a 56-year-old blind visitor touches a painting using a relief painting technique that adds volume and texture, a copy of "Mona Lisa" or "La Gioconda" by Italian artist Leonardo da Vinci, part of exhibition "Touching the Prado", at the Prado Museum on June 18, 2015. The painting is one of six copies of works by masters such as El Greco and Francisco Goya made for the museum's first ever exhibition for the blind. This exhibition allows the blind, or those with limited vision, a chance to create a mental image of a painting by feeling it. AFP PHOTO/ GERARD JULIEN / AFP / GERARD JULIEN (Photo credit should read GERARD JULIEN/AFP via Getty Images)

TO GO WITH AFP STORY BY DANIEL SILVA
Jose Pedro Gonzalez, a 56-year-old blind visitor touches a painting using a relief painting technique that adds volume and texture, a copy of "Mona Lisa" or "La Gioconda" by Italian artist Leonardo da Vinci, part of exhibition "Touching the Prado", at the Prado Museum on June 18, 2015. The painting is one of six copies of works by masters such as El Greco and Francisco Goya made for the museum's first ever exhibition for the blind. This exhibition allows the blind, or those with limited vision, a chance to create a mental image of a painting by feeling it.   AFP PHOTO/ GERARD JULIEN / AFP / GERARD JULIEN        (Photo credit should read GERARD JULIEN/AFP via Getty Images)