The On Mountain Hut was a sustainable, zero-impact retreat designed by Thilo Alex Brunner, head of design at Swiss running brand On. Completed in 2019, the temporary, 204-square-foot modular cabin was built on the remote Piz Lunghin mountain in the Swiss Alps, an area at over 2,500 meters of elevation. The project was created to celebrate the company's origins and to mark the launch of its first hiking shoe. It was only accessible by foot, and after its limited run, it was disassembled to leave no trace on the pristine alpine landscape The hut's design emphasized minimalism and reduction. The exterior was clad in a reflective metal that helped it blend into its natural, mountainous surroundings. Inside, the cabin was lined almost entirely with warm, inviting plywood, used for the floors, walls, and built-in tables. A wood-burning stove provided warmth, creating a cozy atmosphere. The cabin featured a series of platforms that led guests from the entrance to a large glass viewpoint overlooking the valley. A lofted mezzanine with a bed offered a unique and elevated vantage point for taking in the stunning views. The off-grid structure was powered by solar panels and a rainwater collection system. Credits Architect: Thilo Alex Brunner Client: On Photographers: Anne Lutz and Thomas Stöckli Contractors: Freund Holzbau, Renggli