British artist Anthony McCall poses for photographers next to a scale model of his work, "Column," during a presentation of his commission for the Cultural Olympiad, in central London March 2, 2011. McCall has been commissioned by Britain's Arts Council and the Cultural Olympiad to create his "column" - a 20 metre wide column of cloud that will rise from the surface of water - on Merseyside next year. REUTERS/Andrew Winning (BRITAIN - Tags: ENTERTAINMENT SOCIETY ENVIRONMENT)