London Fieldworks was formed in 2000 by artists Bruce Gilchrist and Jo Joelson as an umbrella organization for creative research and collaboration of art and science. There are so many of their projects worth noting but I really fell in love with, Spontaneous City in the Tree of Heaven. These installations are somewhat like modern condominium for birds and very beautiful. Be sure to check out Super Kingdom (a 2008 project) as well.
"The installations are constructed from several hundred bespoke bird boxes mounted in two trees of heaven (Ailanthus altissima) and reflect the forms of the surrounding architecture; a combination of Georgian town houses, and 60's social housing around Duncan Terrace Gardens, and the World's End Estate adjacent to Cremorne Gardens."
The installations have been commissioned for the Royal Borough of Kensington and Chelsea and Islington Council by up projects as part of their Secret Garden Project ; a new programme of artists commissions and events for secret gardens, lesser known green spaces, and urban corners across London. They will be in situ for three years.