A woman looks at the chalk, charcoal and hot glue on wood painting 'Chalk or Charcoal' by Pascale Marthine Tayou in London, Friday, March 23, 2018. The painting, estimated 30,000 - 50,000GBP (42,000-70,000USD) is part of a Modern and Contemporary African Art Sale at the auction house Sotheby's. (AP Photo/Frank Augstein)

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