A man views one of a series of works ent [Getty Images]

A man views one of a series of works entitled 'Historic Photographs' which forms part an exhibition of work from six decades by artist and activist Gustav Metzger ' Gustav Metzger: Decades 1959�2009' at the Serpentine Gallery, in central London, on September 28, 2009. Metzger's work represents a life-long involvement in left-wing politics, ecology and the creative and destructive powers of 20th and 21st century industrialised societies. The exhibition runs from September 29 to November 8, 2009. AFP PHOTO/GEOFF CADDICK (Photo credit should read Geoff Caddick/AFP/Getty Images) — see more

A man views one of a series of works entitled 'Historic Photographs' which forms part an exhibition of work from six decades by artist and activist Gustav Metzger ' Gustav Metzger: Decades 1959�2009' at the Serpentine Gallery, in central London, on September 28, 2009. Metzger's work represents a life-long involvement in left-wing politics, ecology and the creative and destructive powers of 20th and 21st century industrialised societies. The exhibition runs from September 29 to November 8, 2009. AFP PHOTO/GEOFF CADDICK (Photo credit should read Geoff Caddick/AFP/Getty Images)

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