A blind person feels with her hands a copy of "The Gentleman with his Hand on his Chest" by El Greco at The Prado Museum, Feb. 10, 2015, in Madrid. "Hoy Toca el Prado" (Touching the Prado) allows blind or vision-impaired visitors to explore with their hands the copies of six masterworks. The copies were created using a technique called "Didu," which provides texture and volume to the paintings.
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