I was driving at noon one day in December and the passenger by my side said "It seems like summer!" The sun was out, the sky was blue, we were inside a car so we could not feel the outside temperature. I was amazed, though, that my companion had not noticed that the shadows were too long for a northern Italian Summer lunchtime. I mentioned this, tactful little sod that I am, and my passenger got shirty and huffy with me. And I was reminded of an anecdote about Wittgenstein: “Tell me," Wittgenstein's asked a friend, "why do people always say, it was natural for man to assume that the sun went round the earth rather than that the earth was rotating?" His friend replied, "Well, obviously because it just looks as though the Sun is going round the Earth." Wittgenstein replied, "Well, what would it have looked like if it had looked as though the Earth was rotating?” Now, I must admit, I've had to read the pr