"I can make the sky any color you choose." —James Turrell Measuring 40 feet in diameter and 40 feet high, a repurposed concrete water tank on the MASS MoCA campus transforms into C.A.V.U., one of James Turrell’s signature immersive light installations, carving out a small piece of the sky and framing it as a canvas with infinite depth. C.A.V.U., 2021. © James Turrell. Photo: Florian Holzherr