pacman.    The Rolling Bridge was conceived by British designer Thomas Heatherwick.  The bridge consists of eight triangular sections hinged at the walkway level and connected above by two-part links that can be collapsed towards the deck by hydraulic cylinders. When extended, it resembles a conventional steel and timber footbridge. To allow the passage of boats, the hydraulic pistons are activated and the bridge curls up until its two ends join, to form an octagonal shape.