JR creates pervasive art that spreads uninvited on buildings of Parisian slums, on walls in the Middle East, on broken bridges in Africa or in favelas in Brazil. People in the exhibit communities, those who often live with the bare minimum, discover something absolutely unnecessary but utterly wonderful. And they don't just see it, they make it. Elderly women become models for a day; kids turn into artists for a week. In this art scene, there is no stage to separate the actors from the spectators.
After these local exhibitions, two important things happen: The images are transported to London, New York, Berlin or Amsterdam where new people interpret them in the light of their own personal experience. And ongoing art and craft workshops in the originating community continue the work of celebrating everyone who lives there.
As he is anonymous and doesn't explain his huge full-frame portraits of people making faces, JR leaves the space empty for an encounter between the subject/protagonist and the passerby/ interpreter.