[kohtatsu]

I think that's a stretch. I like the calendar, but from what I can tell it's only useful for looking up the day of the week that a date falls on; shrinking it like this is similar to lossy compression.

With a moderate amount of practice you can also calculate a weekday given a date in your head! (Though I'd rather use this w)

https://plus.maths.org/content/what-day-week-were-you-born

So this is not exactly a "product"; people wouldn't fork over money for this. It's a neat design concept.

To add: CLIs aren't necessarily clever (I'd add rarely clever), and Windows-like products can often be far from simple. There are learning curves involved, but I think that's (mostly) a separate matter than simplicity/cleverness.

Again I think this calendar is cool, props to OP for thinking outside the box and making something for the new year~