Impressionist and Modern auction sales kick off in London ; will test the strength of the global art market . Popularity for Impressionist and Modern artworks still high , in spite of problems in the global financial markets . Star lots of sales at Sotheby 's and Modern include paintings by Picasso , Modern , Modigliani and Modigliani . Prices stay high because of rarity of great works by Impressionist and Modern artists with historical provenance .
Impressionist and Modern auction sales kick off in London ; will test the strength of the global art market . Popularity for Impressionist and Modern artworks still high , in spite of problems in the global financial markets . Star lots of sales at Bonhams and Sotheby 's include paintings by Monet , Klimt , Modigliani and Picasso . Prices stay high because of rarity of great works by Impressionist and Modern artists with historical provenance .