DS-600 sofa

Conceived in 1972 by Ueli Berger, Eleonore Peduzzi-Riva, Heinz Ulrich and Klaus Vogt for Swiss manufacturer de Sede, the DS-600 — known as the "Snake" or "Tatzelwurm" — broke with every convention of what a sofa could be. Rather than a fixed object, its designers proposed an open-ended system: identical seat elements joined by zippers, allowing the sofa to extend, coil, and re-form to its surroundings. Furniture conceived as architecture.

Hand-upholstered in aniline leather over a high-density foam core, each element is built in de Sede's Klingnau workshops, where saddlers have refined the model for over fifty years. The DS-600 holds the Guinness World Record as the longest sofa ever produced and is held in the collections of the Vitra Design Museum (Weil am Rhein) and the Museum für Gestaltung (Zurich).