When I try to outline the history of ethical life, it's sometimes possible to find evidence for a hypothesis about how important transitions actually went. Often, however, that isn't so. There are many facts about human life in the Paleolithic we're never likely to know.

The amalgam of psychological attitudes we form is the synthetic complex. It may fall apart quite quickly as further reflection or further experience bears on it, and we may revert to our former judgments, feelings and tendencies.

There's a disciplined erotic component to it, so that the height of sexual contact is the embrace, the modest touch, a relatively chaste kiss. An important passage from the surviving 1942 diary (one I quote in the book) relates this mode of sexual expression to his own life. Mann had returned to his diary for 1927 (one of those he burned) and to his parting from the young man, Klaus Heuser, whom the family had met on holiday and invited to Munich.

I'm often quite gloomy about the prospects for the human future. But, although I have no competence to intervene directly in a political movement, I hope that what I write may, in combination with the suggestions of others, cause a shift in perspective that will inspire a world-wide movement to accept the only solution to climate change. And before it's too late.

Even though I want to expand the number of ways in which skilful ironic play happens, I suspect I'm probably guilty of the same shortcoming - and I hope that, one of these days, someone will claim that my book, while it goes in a salutary expansive direction, doesn't go far enough, that there are assumptions I make that show I've missed aspects of Mann's irony and ambiguity.

Britten's opera tends to see things in simpler terms. It portrays an Aschenbach who wants a richer form of sexual fulfillment, and who is hemmed in by the social conventions to which he subscribes. But Visconti's use of the Mahler Adagietto is perfect for what I take to be Aschenbach's sexual desire.

Was Mann himself fully aware of all the facets of his irony? Probably not - any more than Shakespeare was fully aware of all the riches subsequent critics have found in his plays.