At the installation in the Lobby of the Altes Rathaus on Linz’s Main Square, visitors can take the plunge into this massive data pool that presents not only a snapshot of a geographical location at a particular moment in time but also records the process of development that has occurred here over time. Three modes of depiction— city maps, orthographic imagery and a textured 3D model—are linked up with functions that enable users to navigate through space and time. The aim has been to prepare and make available a multi-layered, multi-faceted depiction of Linz’s past, present and future urban development— a description that would hardly emerge from the accumulated data and individual historical portrayals alone—and to do so in the form of a mobile installation that constitutes an exploratory and analytical tool at the disposal of local government agencies and citizens. To accomplish this, AEC engineers developed an interface that combines elements of a touchscreen, a navigator and haptic objects representing available topics. Just a few navigational steps make it possible for users to access highly descriptive views of developmental processes or to conduct very efficient searches for particular pieces of information.