Waldemar Januszczak examines the secrets hidden in Rembrandt's masterpiece The Anatomy Lesson of Dr Nicolaes Tulp, an oil painting from 1632.

Waldemar Januszczak uncovers the secret meanings hidden within more of the world's most famous paintings, beginning with German Renaissance artist Albrecht Dürer's large 1514 engraving Melencolia.

Waldemar Januszczak uncovers the secret meanings hidden within Marcel Duchamp's Fountain, a readymade sculpture consisting of a porcelain urinal signed R Mutt.