The Swiss artist Harald Naegeli became known around the world as the “Sprayer of Zurich” in the late 1970s. With his graffiti he criticized the monotonous, inhospitable cityscape of Zurich, but also the politics and the handling of the environment. In her sensitive portrait, director Nathalie David shows Harald Naegeli's multifaceted personality - as a visionary, argumentative artist, rebel, philosopher and astute, humorous person.