A Chinese tear-off almanac that hangs on a metal bar. Every page is worked out for its real date: the lunar day, the solar term, what the day is good and bad for, tonight's moon. Pull a page off by hand, write on it with the pen on the chain, and keep a page as an image.
I also packed it into a free Framer component, Poster Rail. Hang your own images on the rail and give it a spin!