: In ubiquitous environments computers and smart devices, especially the technical view on them, disappear and users are supported to concentrate on the tasks they actually intend to perform without having to focus on how the required devices are to be operated. This vision on the one hand further encourages the miniaturization of devices and new design concepts, on the other hand it also implies disadvantages. In such environments it is not really clear to the user which objects in a smart environment possess special capabilities. They also do not easily reveal their spectrum of functionalities. Ubiquitous Computing In the vision of ubiquitous computing created by Mark Weiser, the standard metaphors of mouse and keyboard interaction should be overcome and the computer as interaction device itself disappears in an augmented environment [Wei91]. Users in ubiquitous environments should be able to concentrate on their tasks at hand and not have to care about the devices’ usage. Weiser c...