This was the first thing that made me realise that calendars could be changed. I myself don’t like it because it because It doesn’t use fixed points. But it is an inspiration for the calendar that I described in the other comment. It’s the “don’t do this” kind of inspiration but I think it counts.
One of the more interesting calendar concepts I’ve heard where every date falls on the same day of the week year after year. https://en.wikipedia.org/wiki/Hanke–Henry_Permanent_Calendar
This was the first thing that made me realise that calendars could be changed. I myself don’t like it because it because It doesn’t use fixed points. But it is an inspiration for the calendar that I described in the other comment. It’s the “don’t do this” kind of inspiration but I think it counts.