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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! After some digging, I found two US patents as really good references of how this mechanism works: flip calendar flip calendar It was a little math problem figuring out how to evenly represent 1 through 31 using three different types of wooden tiles. I wanted to do this to be able to see how the tiles flowed through the calendar. I probably should have made both sides of the calendar with the acrylic windows just to make it look move balanced and symmetrical, but I wanted a “how does this work“ side and a “this is how it works“ side. I didn’t show it here, but you can count downward if you flip the calendar the opposite way. You can also “reprogram“ the calendar to flip the opposite way if yo
