Cities can grow to defy our current perceptions of plausibility. In the future, each spire in a collection of gleaming, vertical towers could harness density through a mixture of use types from working to living to growing food. Not only could each building produce its own renewable energy, but the excess could be pumped back into the city around it to help power the seamless public transit system ranging from lighted bike paths to high speed trains that allowed people to sail from one urban core to the next. Air quality would rise, water use would fall and the cultural affordability would compliment density with diversity. In a word, Oz. Continue Reading…