Adam Thirlwell writing on ‘How Baudelaire Revolutionized Modern Literature’:
The investigation of tone in Baudelaire is an investigation into humiliation; and this humiliation, in Baudelaire’s theory, is the result of his conviction—to us, perhaps, counter-intuitive—that everything natural is corrupt. […] All of Baudelaire’s writing is based on this refusal of Nature as natural. Instead, what is really natural is melancholy, and perversion.
More at the New Republic.