In the Internet of Things, physical objects, or Things, are integrated into a virtual world that harbors capabilities to augment the physical appearance of those Things with additional information. In this paper, we present a software solution that enables users to deduce additional information from Things by querying the relations between them. These relations are represented by a joint knowledge base that is constructed on the fly from ontologies that are associated with the Things. Based on the information found in the acquired knowledge, suitable applications are instantiated to process and represent the knowledge about the Things to the user. The practical use of the presented solution is illustrated by a concrete scenario.