The artwork that will adorn the ceiling of the first gallery at the Natural History Museum is a tree. Not, I'm afraid, the one we were bigging up the day after the launch of Darwin 200. But a tree nonetheless. A "17 metre-long permanent installation" of a tree, "cut lengthways to include the roots, trunk and branches." Wowsers. Artist Tania Kovats' concept was selected by judges from 10 proposals and will be unveiled on......