About four years ago I made a change to this diary, adding topics, or categories. Nothing new; others have been doing it for years. But of course I wanted to do it My Way. Not too many categories; people will miss things like that. And preferably ones that are orthogonal. At the time, it seems that computers (technology, for want of a better term), photography and multimedia were relatively orthogonal, but they're coalescing. All the more reason for a small number of categories.
