For 45 years, the light sculptor has been designing and building a complex inside Roden Crater, a volcanic cinder cone about 50 miles northeast of Flagstaff. In his 70s (he turns 78 this year), he had begun to think there was no hope of living to complete his ambitious plans. Then $10 million in seed money arrived from (of all people) Kanye West, more donations followed, Arizona State University agreed to join in as partner and operator — and now construction is in high gear. Here’s a rare look inside. – Smithsonian Magazine