by Claudine Zap Against the concrete walls of the city scape of Manhattan's Upper East Side, a building made only of bamboo and climbing rope has sprouted . The artistic creation is the vision of twin brothers Doug and Mike Starn . The photographers had a vision: They gathered a team of rock climbers â€" who don't have a fear of heights and are good at tying knots â€" to make it real. From the rooftop garden atop the Metropolitan Museum of Art , the sculpture grew.