In this poem, regeneration takes on huge spiritual overtones. The artwork and the work of human life become one and the same as our speaker tries to figure out how to break through the boundaries of human experience. What is the soul capable of? Exactly how much of the artist’s intention is reflected in the work he/she creates? Yeats is using some specialized symbols here, but the general concepts he works with are pretty commonplace. After all, nearly every superhero we’ve ever read about goes through some sort of emotional transformation. Chances are that they change their appearances, as well. That’s all our speaker is asking for. Asking to become superhuman isn’t that big of a request, is it?