Las fall street artists MOMO and El Tono were invited collaborate on a project for the Bien Urbain festival in France. Both artists often work with an abstract painted style. For their collaboration, though, the artists added a third dimension. Using pieces of wood, the artists filled gaps in walls and windows throughout the city. Instead of being unused negative space, the gaps were transformed into a framing device for these abstract compositions. Simple but elegant, the series is illustrative of innovative trends in street on new approaches to interacting with the urban environment.