Assistants help construct a new bamboo structure that opened Tuesday on the roof of the Metropolitan Museum of Art in New York. Entitled "Big Bambu: You Can't, You Don't, and You Won't Stop," the 15 meter (50 foot) high structure by twin brothers Mike and Doug Starn contains 5,000 bamboo poles in an arrangement reminiscent of scaffolding. The structure -- which visitors can walk through -- will be built by a team of artists and rock climbers over the course of the spring, summer and fall.