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With the ubiquity of powerful, mobile computers and§rapid advances in sensing and robot technologies,§there exists a great potential for creating advanced,§perceptual computing environments. In this work, we§investigate techniques for integrating passive,§vision-based sensing into such environments, which§include both conventional interfaces and large-scale§environments. We discuss a methodology for§vision-based human-computer interaction called the§Visual Interaction Cues (VICs) paradigm. In the§VICs paradigm, users interact with the computer§system through natural hand gestures. We capture a§"language of interaction" in which individual§gestures are the words and sequences of gestures are§the sentences. We give examples of both individual§gestures and the gesture language, and present them§on our next-generation interaction platform, the 4D§Touchpad. Ultimately, our work takes a concrete step§toward perceptual user interfaces.