We received an invitation to create an installation/event centered around the concept of "underground." To select suitable locations, we embarked on search quests throughout the city, exploring both familiar and unfamiliar places. Our searches led us to various spaces such as attics, abandoned buildings, and empty parking lots. We found the paradoxical contrast between tall residential buildings and neglected upper floors, like attics and terraces, particularly intriguing. The terrace became the primary focus of our proposal. Our intention was not to limit the events to a single site; instead, we aimed to extend them across the city, uncovering and activating new locations. The presence of people was of utmost importance in shaping the proposal, as it relied on human engagement for its realization. The events, whether planned or spontaneous, were spread through diverse channels such as social media, brochures, or good old-fashioned word of mouth. Information about each event would be provided on a map, indicating only the date and venue. To ensure visual coherence, a distinctive symbol representing the project would be used and reproduced for each event. On May 18, 2010, the inaugural Upperground event took place on the roof of 7 Étienne Dolet Street in Saint-Étienne, France. It marked the launch of our project, setting the stage for future experiences and engagements.