This new play pavilion completes one of William Penn's original squares of Philadelphia by integrating landscape and structure with active play.  Together with Studio Bryan Hanes, Landscape Architect and master plan designer for the site, StudioMB has crafted a design that draws upon geological formations of the nearby Wissahickon Valley to allow children to roam, climb and play on wood, stone and nets hovering over a natural landscape. Photography by Sahar Coston-Hardy