In this book, mobility as socially produced motion is understood through three relational moments. First, when talking of human mobility, we are talking about mobility as a brute fact—something that is potentially observable, a thing in the world, an empirical reality. Th is is the mobility measured and analyzed by modelers, migration theorists, and transport planners. It is the mobility captured by high-powered computer hardware and soft ware in sports science labs or animation studios. It is the motion tracked by closed circuit television and biometric systems in airports and elsewhere. Here mobility comes closest to pure motion and is at its most abstract. Second, there are ideas about mobility that are conveyed through a diverse array of representational strategies ranging from fi lm to law, medicine to photography, literature to philosophy. Th ese representations of mobility capture and make sense of it through the production of meanings that are frequently ideological. Mobility means this. Mobility means that. Th us the brute fact of getting from A to B becomes synonymous with freedom, with transgression, with creativity, with life itself. Th ird, mobility is practiced, it is experienced, it is embodied. Mobility is a way of being in the world. Th e way we walk, for instance, says much about us. We may be in love, we may be happy, we may be burdened and sad. We inhabit mobility diff erently according to our mood. Human mobility is an irreducibly embodied experience. Our feet may hurt as we walk, the wind might blow in our face, we may not be able to sleep as we fl y from New York to London. Oft en how we experience mobility and the ways we move are intimately connected to meanings given to mobility through representation. Similarly, representations of mobility are based on ways in which mobility is practiced and embodied. As David Delaney has written, “human mobility implicates both physical bodies moving through material landscapes and categorical fi gures moving through representational spaces.”8 Mobile people are never simply people—they are dancers and pedestrians, drivers and athletes, refugees and citizens, tourists or businesspeople, men and women. Th is book is about the interface between mobile physical bodies on the one hand, and the represented mobilities on the other. To understand mobility without recourse to representation on the one hand or the material corporeality on the other is, I would argue, to miss the point.