I have enormous respect for Derek Parfit, although he seems to me bound within an unfortunate philosophical tradition - rather like the extraordinarily brilliant exponents of Ptolemaic astronomy in the Middle Ages.

Critics who perceive the first level of Mann's irony recognize that the second voice is giving us reasons to be dubious about various aspects of Aschenbach's life and work. But many of them don't appreciate the second level of irony, the one exemplified in setting this narrative voice alongside the more sympathetic one, and inviting us to choose.

So my methodological approach is to draw on many different features in highlighting different facets of the novella (and the opera and the film).

First, my frame of reference for the Britten opera shifted. I'd always thought of Britten's approach in Death in Venice as another exploration of the plight of the individual whose aspirations are at odds with those of the surrounding community: his last opera returning to the themes of Peter Grimes. As I read and listened and thought, however, Billy Budd came to seem a more appropriate foil for Death in Venice.

Read Mann's notes, which contain precise accounts of cholera and its symptoms, and observe how careful he is throughout his fiction in getting medical details straight - then you might begin to wonder whether cholera is the only candidate for the cause of Aschenbach's death. What results from this, I think, is a deeper appreciation of Mann's brilliance in keeping so many possibilities in play. The ambiguity is even more artful than people have realized.

Mann was profoundly influenced by two philosophers, Schopenhauer and Nietzsche, who returned to the most ancient of all philosophical questions - "How to live?" - and whose writings offered novel perspectives for considering that question (much more perspective-offering than rigorous argument!)

Wilhelmine Germany was hostile to the expression of same-sex love - and, of course, Mann would have known of the fate of Oscar Wilde. His early reading of Platen's poetry, and, probably when he was in his early twenties, of Platen's diaries, introduced him to a form of sexual expression he found profoundly congenial. It's not quite Platonic.