For much of the industrial age, factory roofs with sawtooth clerestories brought steady north daylight into spaces where workers toiled at assembly lines and production tables. For today’s office workers, the Bjarke Ingels Group (BIG) flipped this model on its side, wrapping the facades of the Shenzhen International Energy Mansion with a zigzagging curtain wall made of alternating panels of glass and powder-coated (PVDF) aluminum. Like its industrial predecessor, the 21st-century wall system blocks a great deal of direct sunlight, reducing solar loads by 30 percent, according to the architects. BIG then took the concept one step further, pulling on the vertical folds in certain places, so they form supple curves that animate the elevations in surprising ways.