What Techniques Did Claes Oldenburg Use?

What Techniques Did Claes Oldenburg Use? Whereas Pop artists had imitated the flat language of billboards, magazines, television, etc., working in two-dimensional mediums, Oldenburg’s three-dimensional papier maches, plaster models, and soft fabric forms brought Pop art into the realm of sculpture, a key innovation at the time. What does Claes Oldenburg use for his sculptures?