The graceful Quadracci Pavilion is a sculptural, postmodern addition designed by Spanish architect Santiago Calatrava. Highlights of the building are the magnificent cathedral-like space of Windhover Hall, with a vaulted 90-foot-high glass ceiling; the Burke Brise Soleil, a moveable sunscreen with a 217-foot wingspan that unfolds and folds twice daily; and the Reiman Bridge, a pedestrian suspension bridge that connects the Museum to the city. The structure incorporates both cutting-edge technology and old-world craftsmanship. The hand-built structure was made largely by pouring concrete into one-of-a-kind wooden forms. The Museum's signature wings, the Burke Brise Soleil, form a moveable sunscreen with a 217-foot wingspan. The brise soleil is made up of 72 steel fins, ranging in length from 26 to 105 feet. The entire structure weighs 90 tons. It takes 3.5 minutes for the wings to open or close. Sensors on the fins continually monitor wind speed and direction; whenever winds exceed 23 mph for more than 3 seconds, the wings close automatically.