Martin Creed: What's the point of it?

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Playful and democratic in spirit, the work of Turner-Prize winning artist Martin Creed can be as permanent as a marble staircase (Work No. 1059 – The Scotsman steps), or as ephemeral as a room half-filled with balloons (Work No. 200 – Half the air in a given space). Crossing between modes and mediums with apparent ease, over the past 25 years Creed has used everything from neon and cacti to dogs and pianos in his install...