MADRID, SPAIN - FEBRUARY 10: Visitors enter the Prado Museum on February 10, 2015 in Madrid, Spain. The Prado Museum is running an exhibition called 'Hoy toca el Prado' (Touch The Prado) which 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)
