Enough of the deep-and-meaningful musings, I’m going to wrap up Pendulum Week with perhaps my favourite pendulum demo of all time. “Foucault’s!“, I hear you cry?

Well, firstly: no need to be rude. Second: actually, no. Well, sort-of no. Which is to say, yes. Ish. Only without the… er… pendulum. Look, here it is:

…and I’ll let you, dear reader, work out what to do with this one. Lovely demo.