"Perpetual flip calendars have been around for a while. They seem operate very simply, but I could not for the life of me figure out how!" says woodworker and YouTuber Measured Workshop, who ...

Now he has: the DodeCal is a dodecahedron-shaped, Scandinavian-looking calendar made out of sycamore wood. It costs $96 (£79), and comes in a limited run of 100, for the year 2017.