Kansai International Airport is located on an artificial island, specially built in Osaka Bay. The shape of the roof of the terminal arises from a long work on the dynamic lines of the air flows circulating in the building. It has been designed to convey air from the passenger side to the track side without requiring the use of closed conduits. Blade-like baffles guide the airflow along the ceiling and reflect the light coming from above. This eliminates all the elements that would have prevented the structure from being seen. Even the curves of the "wings" of the building are the result of the application of a strict law: they have been defined on the basis of a toroidal geometry. The curvature is almost imperceptible, but it was necessary to favor the side view from the control tower.