The cooperation of Trix and Robert Haussmann with the Roethlisberger carpenters, which started in 1979, yielded numerous successful experiments in artistic and handcrafted furniture. Not comparable to furniture from the retail store, these exclusive designs were sold as a limited edition of 15 pieces each. For the first time, a publication presents the full scope of furniture that was developed in Trix and Robert Haussmann's "Allgemeine Entwurfsanstalt" for the Roethlisberger Kollektion. The design objects were highly sophisticated in the planning of each detail as well as their realization and required a high level of innovation, new techniques and technical expertise. The close collaboration and good relation between manufacturer and designers were what constituted the special appeal of the finished products.