Now that she’s gotten her sea legs, Mary Mattingly, an artist who spent her summer living on an eco-art-barge floating around the city, is looking to move on up (to the sky). Ms. Mattingly has proposed that her next project, called “Air Ship Air City,” be installed atop the Metropolitan Exchange Building, a seven-story design and research cooperative in downtown Brooklyn, whose members have given the initial green light to the idea, according to theBrooklyn Paper. The plans for the structure include a chicken coop – the barge, the Waterpod, was home to four chickens – a research lab, hanging gardens, potential living quarters (called the Flock House) and a communal area featuring outdoor couches that Ms. Mattingly envisions as a sort of human nest.