The Tate is the most popular tourist attraction in Europe. Conceptual artists like Tracy Emin and Damien Hirst enjoy celebrity status. Works by 20th century abstract artists like Mark Rothko are selling for record breaking sums at auction, while the millions commanded by works by Andy Warhol and Francis Bacon make headline news. But while the general public has no trouble embracing avant garde and experimental art, there is mass resistance to avant...