CHAPTER Tangible Interfaces for Ambient Augmented Reality Applications ¨ Mark Billinghurst, Raphae l Grasset, and Hartmut Seichter Human Interface Technology Laboratory New Zealand (HIT Lab NZ), University of Canterbury, Christchurch, New Zealand 11 11.1 Introduction ........................................................................................................... 282 11.1.1 Rationale for Ambient AR Interfaces ................................................... 282 11.1.2 Augmented Reality ............................................................................ 284 11.2 Related Work ......................................................................................................... 285 11.2.1 From Tangibility . . . ............................................................................ 285 11.2.2 . . . To the AR Tangible User Interface ................................................. 286 11.3 Design Approach for Tangible AR Interfaces ............................................................ 287 11.3.1 The Tangible AR Interface Concept ..................................................... 287 11.4 Design Guidelines .................................................................................................. 288