His wife's "communications" ultimately provided him with the system of symbolism
described in A Vision (1925) and which forms the underpinning of many of the
poems in Michael Robartes and the Dancer (1921), Seven Poems and a Fragment
(1922), The Cant and the Moon and Certain Poems (1924), October Blast (1927),
The Tower (1928), The Winding Stair (1929), Words for Music Perhaps and Other
Poems (1932), Wheels and Butterflies (1934), The King of the Great Clock Tower
(1934), A Full Moon in March (1935), New Poems (1938), and Last Poems and Two
Plays (1939)
LI> Yeats served as a Senator of the Irish Free State from 1922-1928