Over the past six months, on a patch of desert ranchland outside Marfa, Texas, one man's mysterious vision has been taking shape. First, nine massive chunks of quarried black marble were trucked in from northern Mexico and craned into a circular formation, echoing Stone and Bronze Age erections in the British Isles. Next, one of the megaliths, the "king stone," was outfitted with a state-of-the-art solar array; at the same time, the other eight were carved to integrate LED lights and speakers.