Exhibiting artists: Alexander Calder, Sandro Chia, Edgar Degas, Jean Dubuffet, Barry Flanagan, Barbara Hepworth, David Hockney, Hans Hofmann, Fernand Léger, Jaques Lipchitz, Henri Matisse, Joan Miró, Henry Moore, Ben Nicholson, Mimmo Paladino, Francis Picabia, Pablo Picasso, Sean Scully, Yves Tanguy, Mark Tobey, Cy Twombly and HC Westermann