The poem Haniwa reads ("Turning turning in the widening gyre...") is "The second coming" by W. B. Yeats.
Spiritus Mundi is a Latin phrase that literally means "world spirit." In Spiritus Mundi, there is, according to William Butler Yeats, ''a universal memory and a muse of sorts that provides inspiration to the poet or writer.'' To Yeats, Spiritus Mundi is the source of all ''images'' and ''symbols,'' a ''collective unconscious.'' It refers to the belief that each human mind is linked to a single vast intelligence, and that this intelligence causes certain universal symbols to appear in individual minds. The idea is similar to Carl Jung's concept of the collective unconscious.