The Saatchi Gallery in Chelsea opens a new exhibition today where it collaborates with dealer Toby Clarke of the Vigo gallery to show and sell work by the Belgian painter Bram Bogart. The artist, who died in 2012, is best known for the thick licks of brightly coloured paint that comprised his canvases. This exhibition consists of the least-known of his works, pure white paintings; thus the title of the show, Witte de Witte. Prices will range from £37,000 to £105,000.