Oripeau is a participatory graphic design project initiated by Atelier la Casse in 2019. It invites designers, illustrators, architects, and street artists worldwide to contribute posters and flags that are displayed on a public billboard in Nantes and Montréal. With biannual open calls, Oripeau showcases diverse visual styles in urban spaces, reclaiming the street as a platform for creativity and exchange. To date, it has featured contributions from all over the world, transforming the city into an evolving, open-air gallery.