Colour charts
More from ArtsGerhard Richter: 4900 Colours Serpentine Gallery, until 16 November Lucian Freud: Early Works, 1940–58 Hazlitt Holland-Hibbert, 38 Bury Street, London SW1, until 12 December At the Serpentine is an exhibition of little squares of colour, randomly arranged in grids. There are 49 paintings on show, each one composed of four panels consisting of 25 squares