This book is a collection of essays and original material that introduces the avant-garde artist-collaborators, La Monte Young and Marian Zazeela to those unfamiliar with their life and art, as well as providing the more acquainted readers with new and useful insights and analyses of the fundamental issues in their life and work. The book explores the recurring themes that have influenced Young's minimalist music and Zazeela's ongoing engagement with the use of light in art. These themes include the importance of nature and its natural shapes and sounds, the importance of mathematics and organized tuning systems based on natural harmonics, enhanced attention spans and increased sensitivity to differences within apparent sameness, extensions of time, and alterations of space. Essays by Terry Riley, John Schaefer, Henry Flynt, Christine Christer Hennix, Mitchell Clark, Kyle Gann, Ben Neill, and Robert Palmer are included. Young and Zazeela contribute to the book with original text materials that focus on continuous sound and light environments.