Working with Juan Alberto Belloch, the mayor of Zaragoza, Spain, MIT developed a programmable water wall composed of digitally controlled solenoids that release water droplets to create a dynamic, urban-scale intervention for Expo 2008. This project focuses on the potential of advanced communications and media technology in the public realm of the Milla Digital in the center of the old city of Zaragoza, rather than in its buildings and private development. The result is an urban design and digital framework, and specific proposals for digitally enhanced environments that will serve the learning, skill development, and social interests of Zaragoza's citizens, as well as making the city more attractive for business growth and tourism.