Drawings of locations representing London's essential character have gone on display in Bankside's Holland and Sumner Streets.
Pencil drawings by Swedish artist Martin Karlsson have been enlarged to decorate the new perimiter fence to the south west of Tate Modern. The hoarding replaces the double hedge which has been uprooted to allow work to begin on the gallery's extension.
The 123 drawings, inspired by Gustav Doré, were produced over two years.
"I played a game called Chill, mainly set in Victorian London, in an atmosphere of Sherlock Holmes, Jack the Ripper and Gothic mysteries," says Martin Karlsson recalling his chilhood.
"I remember images by the French 19th-century artist Gustave Doré illustrating the game. They made a lasting impression."
The Doré images appeared in 1872 in a book called London: A Pilgrimage. The Karlsson outdoor exhibition is called London: An Imagery (2010).
Doré's frontispiece is Old Father Thames whilst Karlsson has found the Old Father Thames relief on the Thames Path in Vauxhall to include in his show.
Doré drew Billingsgate Market opposite Hay's Galleria but Karlsson has had to go to Docklands to find today's fish market.
The outdoor exhibition, which is expected to remain in place until 2012, was opened on Monday in pouring rain.
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