I have long introduced addenda to my writings. Every addendum comes with a date, which always supersedes the piece of writing to which it extends. But I have also introduced the habit of citing in parentheses pieces of my own writing to which I am referring to. From now on, I will call them citata—that is, previous pieces of mine that are relevant to the argument. Every piece of writing containing a citatum also comes with a date, which always supersedes the piece to which it refers. Some citata also appear in addenda, in which case they always supersede the piece of writing referred to, as well, but the piece of writing they extend may either precede or supersede it. Now, I have meticulously recorded every addendum over nearly forty years. Not a single citatum is thus recorded to this day, though. All of a sudden, the asymmetry strikes me as appalling, for both addenda and citata interlace my writings through time. Having come up with an adequate name for noting backward and forward connections between my pieces of writing, I have to come up with an adequate way to record them through time. Goodness gracious, it may take me years to complete this record!