Intervention in the shape of a game: a 1mx1m grid is traced on the lawn. Charts are handed out containing coordinates and pieces of a drawing that should be reproduced inside this mash. As the pieces of drawing are gathered together, they form a large world map.The ensuing activity consisted of asking children where their parents came from, where they were at that moment, and where would they like to travel to. This was made as they walked on the map according to the answers they provided. At last, a soccer match erased all the previously traced lines, symbolically opening all the frontiers represented on the map.This game allowed young immigrants at the Balzac Social Center, in the outskirts of Paris, to discuss how borders are built either on a geographic/political basis or at a symbolic/cultural level, and envisage the possibility of re-drawing them up.