Ambient intelligence has the goal of embedding context-sensitive technology into the usertextquoterights surroundings. In many ways augmented reality (AR) is complimentary to this in that AR interfaces seamlessly enhance the real environment with a virtual information overlay. The two merge in context-aware ambient AR applications, allowing users to easily perceive and interact with the interface using the AR overlay of the real world. In this chapter we describe how tangible interaction techniques can be used to design human-centric inter- faces for ambient AR applications. Examples will be drawn from current and previous research in augmented reality and ambient interfaces, and design guidelines will be given to show how human-centric tangible AR interfaces can be developed.