Constantly changing live conditions and frequent moving is typical for our generation. These factors define the products we own and how we use them. So there has been the task of designing a product which not only meets the requirements of our generation but also questions the life cycle of todays products. The modular furniture „Klopf - Klopf“ consists of three different components and a set of connection-clamps (while length and number of parts is decided by the customer). The parts are tapped together with a hammer to a user-designed furniture. Therefore, it is possible to transform and extend the furniture according to the user‘s circumstances. The parts are made out of oak wood and are left as semi finished products, which enables not only a simple production, but also gives the possibility to reuse the material for other purposes.