I didn’t write yesterday because I had to spend a chunk of my day getting my head of little brain around the excessively abstract stuff called Category Theory. (This is another of those maths fields where it’s far from clear why the name x of x Theory has been chosen. What, for another example, is so groupish about the objects of study in Group Theory?)
There’s quite a comprehensive looking introduction in the Wikipedia, which includes the line
Category theory is half-jokingly known as “abstract nonsense”.
Finally, a quote that I found and liked recently:
For books are not absolutely dead things, but do contain a potency of life in them to be as active as that soul was whose progeny they are; nay, they do preserve as in a vial the purest efficacy and extraction of that living intellect that bred them.
I’ll reveal the source next time (ooh, the excitement).