If you're sat at home alone twiddling your thumbs - or whatever it is that you twiddle when you're sat at home alone - why not take on a little project to keep your mind and your thumbs (or whatever) busy?

In spare moments - which these days come mainly while I'm on the crapper (if you only count the spare moments when I'm awake and sober) - I'm pondering the whole problem of cross-cutting concerns and what to do about them.

If you're not sure what I'm...