The Xi Zhi Men Shopping mall sits on one of the busiest public transport intersections in Beijing city. Internally, shopping corridors serve as linkages to train platforms of the adjoining public train transport system. The interior architecture differed from conventional mall design; to improve sightlines to the shop fronts, the corridor ceilings were cambered at the edges to provide unobstructed views from across the atrium. These cambered surfaces were then designed to be advertisement spaces as they were in an ideal angle for shoppers viewing them from the atrium floor, thus giving upper level shops a much desired commercial visibility. The design concept of the interior of the mall was derived from XiZhiMen’s historical significance as a gateway for the transport of water for the Emperor. The interior design concept relates to elements of water, such as waves and bubbles. This starts at the main entrance; walking in under the waves of the canopy into the airlock where walls and ceiling glow with an underwater aura and finally spilling into an atrium space filled with floating lit bubbles.