An artist friend just yesterday noted that the Huffington Post has done a “green” story http://www.huffingtonpost.com/2009/09/08/five-fabulous-green-roofs_n_268638.html on building roofs that are planted with all sorts of grasses and gardens. Rockefeller Center here in New York has one that’s pretty traditional — a formally structured set of garden rooms high in the sky. Also mentioned in the article is my favorite, the top of the new California Academy of Sciences in San Francisco. Open since October 2008, this extraordinary complex is the natural history museum for our time and replaces the old aquarium in Golden Gate Park, sited just across from the beautiful new DeYoung Museum. When I visited on a weekday in late January, it was packed, still very much a hot ticket for locals as well as tourists.