Yeats uses aesthetic beauty as a way of presenting his major theme from “TheSong of the Happy Shepherd” to “Under Ben Bulben.” However, he changes hispoint of views from 3rd person’s objective view to 1st person's subjective one tostrengthen spiritual mystery of beautiful aestheticism. After all, poetic aestheticismis spiritual and personal beyond materialistic and superficial description. Althoughmost his aesthetic vision comes from nature, nature is beyond human codes.
Yeats’s “The Wild Swans at Coole” deals with his spiritual aestheticism throughinteraction of nature and human spirituality in that the poem integrates two opposingand antithetical elements into “mysterious, beautiful” being. Yeats’s spiritualaestheticism revitalizes the significance of his poetic vision which unites divinity andhumanity through integration of human beauty and divine beauty in “Leda and theSwan.” Yeats also integrates history and vision together to recreate poeticaestheticism in that both serve to activate dynamic fusion through aestheticalinteraction.
In his early poems, Yeats utilizes unusual integration of nature and human life.Then, he moves into hierarchical antithesis of natural and spiritual beings.Sometimes, he uses reality and imagination to strengthen his spiritual aestheticism.Also, Yeats explores possibility of the fusion with aesthetic art and sensual life,humanity and divinity. Therefore, in his early poems Yeats frequently uses aestheticdescription as a destination of human life by using definite nouns, but in his laterpoems he rather uses adjective more to strengthen human life as a process ofjourney. In conclusion, Yeats deliberately reinforces the significance of his spiritualaestheticism through dynamic and organic interaction of multidimensional views,nature, myths, faiths, and human codes.