As the Economist foresees a third industrial revolution in manufacturing, it is increasingly plain that the nature of cities is changing globally along the lines of our increasing engagement with work and play online. The trend of movement out to the suburbs has, thankfully, been reversed, meaning a greater amount of active minds in more dense populations. The many branches of urban development (in this book, particular focus is given to sustainability, interconnectivity, community, and commerce) are steeled by a newfound optimism, with small, experimental projects given room to breathe and flourish (or fail and teach us lessons) more and more by civic authorities.