Browning's monologues are frequently voiced by eccentrics, lunatics, or people under emotional stress. Their ramblings illustrate character by describing the interactions of an odd personality with a particularly telling set of circumstances. In both "Porphyria's Lover" and "My Last Duchess", Browning uses this mode of exposition to describe a man who responds to the love of a beautiful woman by killing her. Each monologue offers the speaker's reasons for the desired woman from subject to object: in "My Last Duchess", the Duke may have jealously murdered his wife, but keeps a portrait of her behind a curtain so none can look upon her smile without his permission; in "Porphyria's Lover", the persona wishes to stop time at a single perfect moment and so kills his lover and sits all night embracing her carefully arranged body. In "My Last Duchess" the woman's murder is at best implied, while in "Porphyria's Lover" it is described quite explicitly by the speaker. The unchanging rhythmic pattern may also suggest the persona's insanity.