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.''
This selection comprises The Second Coming, The Adoration of the Magi, Swedenborg, Mediums and the Desolate Places, The Celtic Element in Literature and many more.