The evening Post War and Contemporary art auction at Christie’s in London on October 4 during Frieze Week will be followed by the annual sale dedicated to Italian artists. The sale showcases artists who pioneered new directions for the medium of paint ranging from Sigmar Polke’s dotted raster technique to Gerhard Richter’s ‘Abstraktes Bild’ series and from Joan Mitchell to Kazuo Shiraga. The auction will be led by Basquiat’s Four Big (1982) (\£7.5-9.5 million).

Four Big UPDATE: THIS MADE £8.6 MILLION