Helsinki is a city of interiors. Due to its extreme climatic conditions, Helsinki’s civic society blossoms indoors. Our proposal for the Guggenheim Helsinki, 47 Rooms, extends this network using the architectural technologies that construct Helsinki’s interior citizenry: i.e. walls, doors, windows, and the machinery that defines atmospheric conditions. 47 Rooms contains nine rooms of 20x20m, twenty-seven of 6.5×6.5m six of 10x10m, two of 120x4m and one of 32x120m and three outdoor rooms. A multiplicity of chambers and climatic conditions will allow various museums to live together in the same building. The museum is ready to welcome individual visitors, families, local art scene, high school visits, young audiences, international tourists, groups of friends… 47 Rooms is a machine to provide singular and ever-changing experiences by opening and closing doors to different climates. 47 Rooms extends the logic through which Helsinki’s population already tempers their more intimate public spaces. Imitating the logic of the Sauna, each room’s final climatic conditions include certain degree of negotiation between the institution and its visitors. 47 Rooms means a strategic shift on Guggenheim’s identity: it embraces Helsinki focusing on interior climate rather than external appearance.