In Copenhagen, the waterfront is a central axis of city life, used and valued by residents and visitors alike. It was not always so. At the height of its industry, the city’s canals were heavily polluted. Decades of sustained effort have since made the water clean enough to swim in, and the harbour has become a place where people gather and spend time together. This change reflects a wider culture in which care for the environment is part of everyday experience. Floating Pavilion Ø builds on this condition. Rather than placing a new object on the water, the project treats the harbour itself as public space and asks what more it could hold. The design focuses on the qualities of water itself, its reflections, movement and light, to celebrate the citizens’ efforts. The roof is carried by six transparent acrylic panels, so the structure seems almost absent. The pavilion reads as a volume immersed in the water rather than placed upon it, and its translucent perimeter reflects the surface of the harbour on every side. As the weather shifts and the daylight changes, the pavilion’s appearance changes with it, both from inside and from the city around it. Since its completion, the pavilion has hosted activities that were not possible on the water before: yoga sessions, meditation, tea ceremonies and, during the national lockdown, a socially distanced music event, with performers inside the pavilion and the audience gathered on boats nearby. Each event has shown a new possibility for public life on the harbour, using a resource the city already has. The project was supported by the Danish Arts Foundation and the City of Copenhagen, and the pavilion has been donated to a local charity group dedicated to cultural activities on the harbour.