Tangible CityScape is a platform for users to explore the real 3D cityscape by changing parameters such as population, building capacity, traffic, energy consumption, and shadow simulation for collaborative review of urban planning. By integrating a 2.5D actuated shape display, immersive 2D displays, 3D projection mapping, and handheld AR, CityScape combines the strength of bits (pixels) and atoms (tangibles) to represent city models at different scales and translate the tangible view onto a larger, underlying data set.