Walls play multiple social, political, economic and cultural roles and are linked to the fundamental question of how human beings live together. Globalization and urbanization have created high population density, rapid migration, growing poverty, income inequality and frequent discontent and conflict among heterogeneous populations. The writers in this volume explore how walls are changing in this era, when social containers have become porous, proximity has been redefined, circulation has intensified and the state as a way of organizing political life is being questioned. The authors...