A friend sent me a link to this anonymous blog post
"A wildflower meadow atop a roof in Islington. This picture was inspired by a National Geographic article. I love the idea of having a green roof - a little piece of the English countryside in central London, hidden from the city streets below."
The green roofs on The Muse and other houses are intended to encourage people to think and care about the beauty of nature, so it is particularly moving when someone responds with a beautiful painting.
There are a total of three other paintings of different locations in London on this anonymous blog post http://londonismyoyster.wordpress.com/ . They all date from May and June 2011. Let's hope the approaching summer sunshine will inspire this artist to start painting again.