John Banville: My study is a small apartment in a huge, anonymous, quadrilateral block in Dublin city centre. My window, the one I do not look out of, gives on to a courtyard where no one ever goes, and where the silence is day-long and almost pastoral. When I first began to come here to work, a dozen years ago, I used to shut my door on entering each morning and put the chain on. The place is clean, or cleanish, and, yes, well lighted. Here Here I am unassailable. Or so I like to imagine.