Ryan Gander's piece, aside from the earth work that would have provided a dynamic space, would have directly supported youth performing arts projects in South London with about ?80,000 over the course of the next 10 years. Art with a function, art for the public. Instead the commissioners have picked a useless and non-site-specific piece of art that is, according to those two specifications, no different to the Hepworth that was put there 40 years ago. One might have thought that the idea of "public art" might have advanced somewhat in that time. But I suppose, after all, in these austere times, it's better to spend the full whack on a useless sculpture than on a project that gives money to local youth projects.