Light is acclaimed artist James Turrell's medium of choice. And it shines just right through his Scottsdale skyspace Knight Rise. Completed in 2001, the work is, to put it simply, a circular room with a bench lining the walls and a circular cutout in the ceiling, above a curved wall. Though that description hardly does the piece justice. The way light pours and changes color within the space is something that truly requires an in-person visit to comprehend. Open to the public and free of charge, Knight Rise is located in the Nancy and Art Schwalm Sculpture Garden at Scottsdale Museum of Contemporary Art. Go see for yourself.