COLOGNE.- The halftone dots used by Pop maestro Roy Lichtenstein (1923-1997) are world famous. Taking motifs from the realms of comics and consumerism, Lichtenstein made paintings by piecing together dots and coloured surfaces. But a very different side of his work can be discovered at this exhibition in Museum Ludwig. Around 100 exhibits, chiefly large-scale paintings along with a number of sculptures and drawings, reveal his fascinating explorations of style through the history of art – from Expressionism and Futurism to Bauhaus and Art Deco. Lichtenstein even appropriated works by his artist heroes – Picasso, Matisse, Mondrian and even Dali – and interpreted them in an often ironic and cryptic manner using his own visual language. Many of his early works are based on historic American paintings, such as by Benjamin West. But he also painted after such models as Picasso, Braque and Klee, who according to his own wor