A 1920 abstract painting by Piet Mondrian will be offered at auction for the first time this October at Christie’s in London. The auction house describes Composition III as a masterpiece and estimates that the work could sell for between €23 million and €35 million.Keith Gill, head of modern art at Christie’s, said Composition III was created during a pivotal period in Mondrian’s career. “It was a time when he developed a radically abstract style that would have a profound influence on modern art,” Gill said.