Interactive visualization systems that create a three-dimensional impression for the viewer are increasingly used for both technical and multimedia applications, because the “third and fourth dimension” offer completely new possibilities. For example, morphological information from medical image data can be represented in plastic together with 3D models of organs, or results of data mining can be illustrated and analyzed in an interactive way. For projects from the multimedia field, it is possible to immerse viewers in virtual worlds and research new interaction methods that can be grasped quickly and intuitively.