What themes appear in Caliban upon Setebos and Mr. Sludge, The Medium?

In the works of Robert Browning, the poems "Caliban upon Setebos" and "Mr. Sludge, 'The Medium'" are noted for their display of a skeptical intelligence and a sense of the grotesque.1

These poems, featured in the collection Dramatis Personae (1864), exemplify Browning’s mastery of the dramatic monologue, a form he used to explore the interior processes of unconventional minds. By inhabiting these complex characters, Browning invites readers to engage in the difficult processes of moral judgment and self-discovery. While Browning is often associated with a creed of optimism, these specific monologues highlight his ability to balance that outlook with a critical, probing examination of human nature and belief.21

Would you like to explore how these themes of skepticism and the grotesque compare to the moral arguments found in his earlier work, such as Bishop Blougram’s Apology?