Another of the six rooms looks at secrets of some of the gallery's collection. Recent conservation work on, finally put an end to a long-standing conundrum over authorship.

Originally acquired as a work by Domenico Ghirlandaio, the painting was later demoted, attributed to the workshop of Verrocchio (sculptor and tutor to greats such as Leonardo da Vinci and Sandro Botticelli).

However, after removing layers of old retouching work and using infrared technology, it became clear that Verrocchio himself painted the Virgin, the angel on the left and the landscape in the background; while his assistant, Lorenzo di Credi, painted the angel on the right and the infant Christ.