Plot: Salvador Dali was art's greatest clown, but was he also one of its great geniuses? Journalist Alastair Sooke traces the life and work of the popular surrealist artist travelling throughout Europe and America. From his origins in turn of the century Spain, to his high jinx in New York in the 1970s, Sook reveals this artist's fascinating life story and explains the thinking behind and impact of his most famous works