What is the underlying geometric and symbolic architecture of human history and the individual soul? William Butler Yeats, a Nobel laureate poet, constructs a complex metaphysical system derived from his wife's automatic writing and his own lifelong interest in spiritualism. He argues that human experience follows cyclical patterns governed by the phases of the moon, providing a framework to categorize personality types and historical epochs.

Scholars frequently note the extreme density and hermetic nature of the prose, often requiring secondary guides to fully interpret Yeats's private symbolism. Experts highlight this as a foundational text for understanding the poet's later work, though they caution that it functions more as a personal mythology than a conventional philosophical treatise.