“A city where you can reach in 15 minutes, on foot or by bicycle, all the places where you work, eat, have fun and cultivate your interests. This is the “city of 15 minutes”, the concept developed by the French-Colombian urban planner Carlos Moreno and applied by the mayor of Paris Anne Hidalgo in her project for the urban reorganization of the French capital. Carlos Moreno has also explored these concepts in a book, Urban life and proximity, in which he proposes solutions to address the triple challenge of ecological, economic and social aspects of the city of tomorrow. We interviewed prof. Moreno in order to analyze the complex open-air laboratory that is the city, where our contradictions are expressed and the changes in our lifestyles are experienced.”