We have long been uneasy about our membership in the animal kingdom, preferring to focus on the traits that distinguish us from other species. The built environment mirrors this anxiety, carving out ample space for our cultural aspirations while ignoring our biological needs… Our cities are designed to make us feel separate from nature, when in fact we are a part of nature. For most of human evolution — eighty thousand generations — nature was not a place we went but a place we lived.”