These kinds of "experiments" drive me BONKERS! This one is based even more elitist and flimsy presumptions than the Joshua Bell train station one. Is the statement about art within urban/public spaces? Is it about looking the general public's taste in art? Is it about the concept of the gallery? Is it about graffiti art? The gallery is not neutral. Space, environment, and architecture have such a huge impact on meaning and interaction. Simply taking the theatrical values of one site (gallery) and transplanting that onto another (sidewalk) is sophomoric and, in this case, highly elitist!