The speaker is angry at the fact that he's been overshadowed by a model, a theme, a "sculpture." Something that only exists in our mind's eye has, seemingly, to his perception, defeated him finally in the struggle we all face, our perceptions versus ourselves. We all want to destroy what we actually cherish. Our visions of "beauty" lead us while also leaving us to our own dismay.
The speaker is angry at the fact that he's been overshadowed by a model, a theme, a "sculpture." Something that only exists in our mind's eye has, seemingly, to his perception, defeated him finally in the struggle we all face, our perceptions versus ourselves. We all want to destroy what we actually cherish. Our visions of "beauty" lead us while also leaving us to our own dismay.