Bonhams has two works by the Zero group founding member Günther Uecker Oval (£450,000-650,000) and Vogel (£400,000-600,000), painted in 1958 and 1962 respectively, to lead its London sale of Contemporary art in March. Those are joined by, Séi, a 1991 painting by the Gutai group founding member Kazuo Shiraga. Estimated at £500,000-700,000.