Olafur Eliasson’s Weather Project installation in the Tate Modern’s vast Turbine Hall has been a phenomenal hit with visitors. But it’s coming to an end and Eliasson reflects on why it appealed to people. “I wanted a subject that implied `community’ and that was open-ended. Predicting weather is one way we collectively try to avoid the unforeseeable, which our lives are always about. The weather is a subject about which a community may also permit a high degree of disagreement: I can say `I hate the rain,’ you say, `I love it,’ and you may still think I am a nice guy.”