A gallery assistant at Christie's auction house sits in front of a painting by Joan Miro entitled 'Painting-Poem' (L) on February 2, 2012 in London, England. The artwork, which is estimated to fetch GBP £9 million, is being auctioned in Christie's forthcoming evening sales of 'Impressionist and Modern Art' and 'Art of the Surreal' which will take place between February 7 and February 9, 2012.