BF15 is a preparatory study for the collective's intervention at the BF15 gallery in Mexico, near Monterrey. It includes a photograph, a collage, sketches and notes. The intervention consists in the seamless extension of the wall of the BF15 gallery beyond the property boundaries, invading the sidewalk and the street, entering public space. The artists highlight the permeability between public, professional and private space. Through these actions, they question the definition of those notions, and become involved in negotiations, making connections and exchanges. Interrogating the role of each space and its function is central to their work.