<span>Victor is overcome by rage and regret for his actions. His division of his censure between the creature and himself reflects how much they share the blame, how one cannot be blamed without inculpating the other. Echoes of Prometheus myth (Cursed....you!)</span>
The poet compared imagination to a soaring bird because imagination is limitless, it can do anything and go anywhere, much like a soaring bird, who has the freedom and capabilites to do anything. Both are completely free of bounds.
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