Cranes at Sunset

Looking west towards the Metreon, the Moscone Center (the brightly-lit glass building), and the Civic Center dome in the distance.  Notice how the various metal cranes, though separated by many blocks, all point in the same direction.  At night, they’re free to sway in the wind, some 30 stories up in the air—slow-motion, synchronized, robotic arms in the sky.