Today, 21st December, is the shortest day - the winter solstice.
Here's a photo taken early evening, of some woodwork done years ago at my postal HQ - 1, Howard Road Reigate, RH2 7JE by that infamous Great Train Robber/local carpenter, Ronnie Biggs. To cut a long story short, he went off to South America and was rarely seen again.
I don't know where he learned about geometry, but it's a very strange experience, walking up that staircase. There's something not right.
Apparently he learned the carpentry trade in prison so maybe that explains it.