This exhibition catalogue explores the?secret grounds? (chemicals, paints, and plant juices applied to fabrics, foils, and grids) and line structures (using arabesques by Dürer or Altdorfer)? of Polke?s painting, with a special focus on his resin and curlicue pictures. Exhibition: Museum Frieder Burda, Baden-Baden, Germany (11.02-21.05.2017).