The San Francisco-Oakland Bay Bridge is composed of several parts, beginning with a sleek skyway from the Oakland side that leads to the new, self-anchored suspension bridge--with its looming, single white tower. The span then leads onto Yerba Buena Island in the middle of the bay.
The background on this project was summarized by Doug Stanglin (USA TODAY, September 3, 2013):
"San Francisco's lesser-known bridge unveiled a new look. As part of a unique art project celebrating its 75th anniversary, the West span of the Bay Bridge has been outfitted with 25,000 LED lights (attached to the cables shown below) that will display a variety of undulating designs nightly for the next two years.
So, to view the light show, cousin Barbara found a parking spot on the Embarcadero. I found a viewing point on one of the piers a few blocks north of the Ferry Building and prepared to photograph the show. An Alcatraz Cruises boat (left) and the San Francisco Belle are shown in the foreground in the photo below.
"The Bay Bridge lights will fire up nightly at dusk and turn off at 2 a.m. every night until 2015. The energy-efficient lights cost $30 a night to power for those seven hours.
"'What people will be seeing are abstract sequences which are inspired by the kinetic activity around the bridge,' said Villareal. 'It's not literally traffic or the water or any of those sorts of things.'