There is a problem in the spatial and temporal separation between the varying forms of representation used in urban design. Sketches, physical models, and more recently computational simulation, while each serving a useful purpose, tend to be incompatible forms of representation. The contemporary designer is required assimilate these divergent media into a single mental construct and in so doing is distracted from the central process of design.

We propose an Augmented Reality Workbench called "Luminous Table" that attempts to address this issue by integrating multiple forms of physical and digital representations. 2D drawings, 3D physical models, and digital simulation are overlaid into a single information space in order to support the urban design process. We describe how the system was used in a graduate design course and discuss how the simultaneous use of physical and digital media allowed for a more holistic design approach. We also discuss the need for future technical improvements.