Geometric sunset

I was hosting a group of ex-colleagues this evening, which meant a lot more housework today than I am used to. (Of course, if I were more used to housework, there'd be much less to do when I'm being hospitable.) I interrupted the tidying and cleaning twice: first when a delivery of bits meant I could repair the ethernet connection in the spare bedroom then put the furniture back in place ready for Christmas hosting; and second when I went to drop something off for a friend and spotted this very rectangular sunset.

Every room in the house is now presentable other than my bedroom, which is where I have dumped everything from everywhere else. I find it easier to throw things out when they are all in one place, so I'm aiming for two boxfuls tomorrow.