(now Microsoft PixelSense) since 2009. Beside multi-touch tracking of fingers, the platform supports the recognition of physical objects by their footprints. Several applications, mainly for the use in commercial space, have been presented. Examples range from designing an own individual graphical layout for a snowboard or skateboard to studying the details of a wine in a restaurant by placing it on the table and navigating through menus via touch input. Interactions such as the collaborative browsing of photographs from a handycam or cell phone that connects seamlessly once placed on the table are also supported. Another notable interactive installation is instant city that combines gaming, music, architecture and collaborative aspects. It allows the user to build three-dimensional structures and set up a city with rectangular building blocks, which simultaneously results in the interactive assembly of musical fragments of different composers. The development of the Reactable and the subsequent release of its tracking technology reacTIVision under the GNU/GPL as well as the open specifications of the TUIO protocol have triggered an enormous amount of developments based on this technology. In the last few years, many amateur and semi-professional projects outside of academia and commerce have been started. Due to open source tracking technologies (reacTIVision) and the ever-increasing computational power available to end-consumers, the required infrastructure is now accessible to almost everyone. A standard PC, webcam, and some handicraft work allows individuals to set up tangible systems with a minimal programming and material effort. This opens doors to novel ways of perceiving human-computer interaction and allows for new forms of creativity for the public to experiment with. It is difficult to keep track and overlook the rapidly growing number of all these systems and tools, but while many of them seem only to utilize the available technologies and are limited to initial experiments and tests with some basic ideas or just reproduce existing systems, a few of them open out into novel interfaces and interactions and are deployed in public space or embedded in art installations. The Tangible Factory Planning is a tangible table based on reacTIVision that allows to collaboratively plan and visualize production processes in combination with plans of new factory buildings and was developed within a diploma thesis. Another example of the many reacTIVision-based tabletops is ImpulsBauhaus-Interactive Table and was on exhibition at the Bauhaus-University in Weimar marking the 90th anniversary of the establishment of Bauhaus. Visitors could browse