Only someone who has immersed themselves in the life and art of Robert Smithson for forty years could have written a biography as deep and engaging as Inside the Spiral. Suzaan Boettger illuminates the artist’s religious thought, examines the complexities of his gender identity, and takes a psychoanalytic lens to his sources and esoteric symbolism, bringing coherence to our understanding of this remarkably complicated artist, his body of work, and his writings. A monumental achievement.