Closure

I have written the prisms paper.

Well, sort of. I haven't written the introduction, nor compiled a bibliography. But the meat of it - definitions, theorems, proofs - is down on paper, and in reasonably good shape. I've given a copy to W for his comments, and he will be showing it to T and L this weekend.

It probably still needs a little cleanup, but all things considered, it's just about ready to go out the door. I am content.