That's my last Duchess painted on the wall, Looking as if she were alive. I call That piece a wonder, now: Frà Pandolf's hands Worked busily a day, and there she stands.
Why it works
These four lines lay out all the structural pillars of the dramatic monologue right from the start. The Duke addresses a particular listener (an envoy who is organizing his next marriage), and his nonchalant pride in the painting hints that something is amiss. He mentions the artist and observes that the Duchess looks 'as if she were alive,' seemingly oblivious to the unsettling implication of that statement. The rhyming couplets lend his speech a polished, aristocratic rhythm. The reader picks up on much more than the Duke means to reveal, which drives the form's core dynamic.