Besides the urban gardening and urban farming movements, there are some wonderful artistic creations being developed, using existing walls of buildings. It is about design with nature, rather than over nature. Others refer to biomimcry. For me, these living walls bring beauty back into out lives, a manufactured nature in some ways (Newman and Dale, forthcoming), but more importantly, they call to our tactile senses, and that, I believe, is critical to the implementation of sustainable development.