Ned Kahn’s 12- story, wind-driven kinetic light sculpture, Firefly, is installed as part of one of San Francisco’s greenest buildings, the new Public Utilities Commission (PUC) headquarters. Kahn’s sculpture is a visual expression of the power of the wind, appropriately mounted on the façade of the tower housing wind turbines that generate 7% of the building’s electrical needs. Firefly was recognized by the 2013 Public Art Network Year in Review.