Book excerpt: 'The Complex City: Social and Built Approaches and Methods' explores different ways of understanding the city. The social city approach proceeds from the ground-up, it focuses on human interactions shaped by economic and environmental processes. The built city method looks through a top-down lens, examining policy and planning for buildings and infrastructure, including utilities and energy networks. This volume is different from other city anthologies in that it explores them through their differences, by presenting each chapter in one of the two categories. While there is invariably an overlap between the two areas, they are distinct positions. In doing so the book identifies how, despite their often adversarial approaches, they both belong to the same city. As essential components of the city they should not necessarily be resolved, as it is in this friction where creativity and innovation happens. 'The Complex City: Social and Built Approaches and Methods' is concerned about the ideas and solutions that they both offer. The book’s originality stems from this duality, and from its recognition that cities are living, organic, protean places of opportunity, crisis, conflict and challenge. The chapters demonstrate the complexity of cities as a set of ideas concerning what they engender, how they function and why they continue to act as a catalyst for different kinds of human activity. They explore issues of socio-political import and questions of the city as a physically constructed space. The themes are diverse and include the inception of the city as a place of competition to centres of regeneration and urban withdrawal. They cover a range of city and urban regions from Athens to Wellington from site specific singular perspectives to comparative assessments. The questions they raise include how do we inhabit urban areas, how do we make plans for them, and how do we, at times, ignore them entirely.