The city is made between buildings; in public spaces. This is where people meet, become acquainted with each other and where the essential flows of the city are handled above and below ground. Our urban public spaces offers an excellent opportunity to proactively shape the major transitions and persistent social tasks. Think of biodiversity, greening, new forms of mobility, energy transition and energy generation. With all these tasks, the challenge is also to strengthen the social city by turning public spaces into public domains. It is precisely then that literally the foundations for larger transitions are produced. Our practice-oriented research takes stock of the new tasks, catalogues best practices; and explores new perspectives, such as More Than Human and Responsive Spaces.