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Professional tree climber Matt Kornely of Wisconsin prepares to begin the "human crane" event during which he will be suspended in the air by a rope system while reaching for an empty cardboard box. The International Jamboree is being held at the former YMCA summer camp property south of Belleville through Sunday. The event pits tree climber teams from around the country against other teams in several climbing and rope events related to their profession. This was a timed event, in which the climber had to navigate a distance using the rope suspension sytem to retrieve the box.