Sotheby's said it is sponsoring a Tate Britain sculpture commission for three years, allowing a new work to be created and shown annually instead of every two years. No figures were provided. "For us, it's very much about giving back," said Cheyenne Westphal, Sotheby's chairman of contemporary art in Europe, at a Tate Britain press breakfast in London. "The reason we're in this position is that the art market is very strong, and we've had very good years." Tate also announced that Martin Creed -- the artist best known for the on-off light switch ("Work No. 227: The lights going on and off") that led him to win the 2001 Turner Prize -- had been chosen for this year's Duveens Commission, as the sculpture program is known. Last year's Duveens artist was Mark Wallinger, who, in his "State Britain," recreated peace campaigner Brian Haw's wall- length anti-Iraq-war protest in London's Parliament Square. The work helped Wallinger win the 2007 Turner Prize. By becoming annual, the Duveens sculpture commission -- which earns the artist 3,000 pounds ($5,880) and occupies the vast, columned upper level of Tate Britain --"should become an event that people look forward to each year," said Tate Director Nicholas Serota. Serota compared the Duveens to the Unilever Series, which draws throngs of visitors to Tate Modern's airport-sized Turbine Hall and is sponsored by Unilever, the world's second-largest consumer-products maker. "We really wanted to support something that is tangible, that you can see, and that makes a tangible difference," Westphal said.