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We are investigating a novel user interface paradigm based on zooming, in which users are presented with a zooming view of a huge planar information surface. We have developed a system called Pad++ to explore this approach. The implementation of Pad++ is related to real-time 3D graphics systems and to 2D windowing systems. However, the zooming nature of Pad++ requires new approaches to rendering, screen management, and spatial indexing. In this paper, we describe the design and implementationdoi:10.1002/(sici)1097-024x(199808)28:10<1101::aid-spe190>3.0.co;2-v fatcat:o5ngu7yjhvcejfrccw7c3lsrv4