Like everyone else, the COVID-19 outbreak has placed me in the unusual situ-ation of being confined at home, inside a city deprived by authority of the public part of its social life. Like everyone else, confronted with the void that was opened up, I had to find a way to deal with it. During the weeks of lockdown, and then in the weeks that came after. Looking for a form of attention able to help us to think about what it means to live in a pandemic. Looking for a way to share it with a group of students in architecture, so that they could grasp some of the changes and the shifts in meaning that could be observed by frequenting as far as possible that sensitive place that is the ground floor, the "level zero", of a city.
Keywords: Ground floor, public space, pandemic, Paris, urban anthropology