Morning, you write for maybe three hours, but you’re still just preparing.  But about 3:00 in the afternoon, when I’ve sunk to such a level of concentration that I don’t know who I am, time expands and contracts.  I was working one day in my study and my wife put her head in the door and said, “I’m going to the shops.”  She closed the door and then opened it again.  I said, “I thought you were going to the shops.”  She said, “I have been to the shops.”  But I had no sense of that time having passed.  I was in a different temporal area.  And that’s where you really concentrate. You forget yourself.  You forget your surroundings.  You forget everything.