Concept:The poem explores the sorrow of loving someone who does not return that love.Explanation:The speaker describes the beloved as poison ivy that appears beautiful “like a rose” but is actually harmful.He says, “I should've only looked, and not leapt,” which shows regret for becoming emotionally involved.The image of the woman flying away “on clipped wings of my dream” suggests that the hoped-for relationship never becomes real.The “hornbill” and “locked-up serenade” symbolise a love that is trapped and unfulfilled.These images together reveal that the speaker’s affection is one-sided and not accepted.Answer:Unrequited Love