When I first received this, for want of a better description, calendar, I couldn't figure out how it could possibly work. I left it wrapped in its transparent packaging and sat down to work out all the possible combinations of the two numbered cubes that would allow me to display every date between the first and the thirty-first and not one would do the trick.
And then it hit me.
No prizes on offer. Just curious you understand. Hopefully it will drive you as crazy trying to work it out as it did me.