Many people know that Vincent van Gogh (1853–90) was a 19th-century Dutch artist, a leading light of the Post-Impressionist movement who painted <I>Sunflowers</I> and cut off his own ear. What, perhaps, they don’t know is that he sold, in his lifetime, only one of the 2,100 artworks he painted; that his work <I>Dr Paul Gachet </I>sold for $152 million; that he wrote over 800 letters; and that he s