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Cities accessible in 15 minutes represent a new possibility for reorganizing the urban system (times, spaces and activities) to try to respond to many current challenges, including ageing populations, energy saving and, more recently, Covid-19. A renewed concept of urban accessibility, together with the redefinition of public spaces and "soft" ways of moving (pedestrian and cycle) to reach neighbourhood services, represent a starting point not only from which to face new challenges but also to rediscover the sense of community, especially at the neighbourhood scale. The 15-minute city draws its origins from the concept of the "neighbourhood unit", developed in 1923 in a competition for the city of Chicago, to define compact residential neighbourhoods where the proximity between services and homes contributed to set out the identity character of that part of the city and to create "the sense of belonging" of a …