The works of Joseph Mallord William Turner (1775-1851), one of the best known English Romantic artists, still play a leading role in the art market to this day. Since 1987 the majority of his pictures have been exhibited at the Clore Gallery, a separate building of Tate Britain. Daniel Wiles visits the gallery to explore the life and works of this eccentric artist, and also talks to countless experts and artists in an attempt to establish what it is about William Turner’s pictures that still fascinates so many people.