Contents Preface Acknowledgments About the Authors ix xi xiii Part I CHAPTER 1 CHAPTER 2 CHAPTER 3 Introducing the NUI 1 Introduction 3 The Natural User Interface 9 Ecological Niche: Computing, the Social Environment, and Ways of Working 15 Design Ethos of NUI 21 Less Is More 23 Contextual Environments 27 The Spatial NUI 33 The Social NUI 37 Part II CHAPTER CHAPTER CHAPTER CHAPTER 4 5 6 7