If you’ve passed by One Bryant Park in the past month or so, you may have noticed what looks like a kind of leafy-green Stonehenge clustered in the lobby of the Bank of America building. The three monoliths and twenty-five foot tall archway are made of galvanized steel frames seeded with thousands of ferns, mosses, and lichens, an installation designed by a team from Wallace Roberts & Todd, led by designer Margie Ruddick and sculptor Dorothy Ruddick. The piece is meant as a reminder of the building’s green cred, as the Cook + Fox tower achieved LEED Platinum. Unlike the original Stonehenge, we don’t have to wonder how this one was built. In fact, you can watch it being assembled in the above time-lapse clip, which compresses the entire 42 hours of installation into a mere 30 seconds. Watch as the mysterious shruboliths rise before your eyes, and check some photos after the jump.