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Constraints are confining regions that are mapped to digital operations. These are frequently embodied as structures that mechanically channel how tokens can be manipulated, often limiting their movement to a single degree of freedom. Placing and manipulating tokens within systems of constraints can be used to invoke and control a variety of computational interpretations.We discuss the properties of the token+constraint approach; consider strengths that distinguish them from other interface approaches; and illustrate the concept with eleven past and recent supporting systems. We present some of the conceptual background supporting these interfaces, and consider them in terms of Bellotti et al.'s [2002] five questions for sensing-based interaction. 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