San Francisco’s Bay Bridge lives in the shadow of its more famous neighbour, the Golden Gate bridge. But this week it will be transformed by the world’s largest light sculpture. Almost two miles miles wide and 500 feet high, it uses 25,000 white individually programmed LED lights to create complex patterns in a dazzling display. As dusk falls over San Francisco’s bay, the San Francisco-Oakland Bay Bridge steps out of the shadows. The structure has been turned into the latest, and by far the biggest, backdrop for New York artist Leo Villareal. He has individually programmed 25,000 white lights spaced a foot apart on 300 of the span’s vertical cables to create what is being billed as the world’s largest illuminated sculpture.