  A standard argument for (2), that certain indexicals are essential, goes as follows. To know that I wrote a certain book a few years ago, it is not enough to know that someone over six feet tall wrote that book, or that someone who teaches philosophy at a particular university wrote that book, or … or … or … , for I could know all these things without knowing that it was me who has these properties (and I could know that it was me who wrote that book and not know that any of these things are properties of me). As Shoemaker puts it,