Daniel replies:

It turns out there is something quirky about the way my brain works.  I suppose this will come as quite a surprise to readers, as well as people who know me.  What I'm referring to here is that I can read a book written by myself a long time ago, or even a year or two ago, and it will seem completely unfamiliar to me.  At the same time, if there is an editorial insertion, or a typo, I will notice it.  So, I am enjoying it along with you.   More or less.