Call it art, exhibited as an installation piece in the October 2014 show "Crossing Brooklyn," a collaboration of more than 100 artworks by 35 artists (or groups) who live or work in Brooklyn, presented at the Brooklyn Museum... or call it "A survey of Art from Brooklyn" as hyperallergic journalist Jillian Steinhauer wrote... it exists on the streets as a social practice, albeit using creative means for community-building.
In the 1970s, Jaime Lerner, the former mayor of Curitiba, Brazil, transformed six blocks of the main downtown shopping street into a pedestrian zone in 1972, despite fierce objections from the merchants. He quickly accomplished this change in just three days by installing paving, lighting, planters, and furniture. The once-resistant merchants were impressed by the increase in their business and soon demanded an expansion of the traffic-free district.