Yeats’s Mask, Yeats Annual No. 19 is a special issue in this renowned research-level series. Fashionable in the age of Wilde, the Mask changes shape until it emerges as Mask in the system of A Vision. Chronologically tracing the concept through Yeats’s plays and those poems written as ‘texts for exposition’ of his occult thought which flowers in A Vision itself (1925 and 1937), the volu…