For those of you that still use physical calendars, maybe you like having a dozen photos of hapless kittens or shirtless firemen cycling through the months. But a subset of you might prefer a single grid that will serve for the entire year and that doesn't have any pages to be flipped. If that's the case, the perpetual calendar is for you.

I was not able to track this Russian design to its original source, but this is typical of the genre.

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A fellow named Renan Rozante sells these plans for a laser-cut design.

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I'm not so into this DIY design made from acrylic, but it does add color for visual pop.

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This design on Amazon Japan makes clever use of a metal frame to line the days up with the dates.

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Here's an all-metal design (that I was unable to attribute to the original source).

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My favorite of all of these designs is the Perpetual Calendar designed by Keita Shimizu, because it does not have any excess numbers sticking out of the sides.

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All of these designs have a UX flaw that you design nerds have undoubtedly spotted. That flaw being that there is no provision for obscuring the higher numbers for months that have less than 31 days.