MADRID, SPAIN - FEBRUARY 10: A blind person feels with his hands a copy of 'La Gioconda from Da Vinci's workshop' at The Prado Museum on February 10, 2015 in Madrid, Spain. 'Hoy toca el Prado' (Touch 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. (Photo by Pablo Blazquez Dominguez/Getty Images)