Image by Cmglee, CC BY-SA 4.0, via Wikimedia Commons

A square can tile a plane but can form a repeating pattern. Is there a single shape that can tile but never repeats? That's what's called the "einstein problem".

Link to the article

In 2010, the first never-repeating tile was discovered: the Socolar-Taylor tile. But it's a bit weird, having several separated, disconnected bits.

In 2022, "The Hat" (shown in pic) was discovered, and it's a lot less weird. It only has 13 sides and nice angles that are multiples of 30°.

Example tiling of "The Hat"

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[–] 23 points 7 months ago (7 children)

Can these tiles actually be bought? For the bathroom floor. Or for paving the driveway. :)

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  • [–] 17 points 7 months ago (4 children)

    i 3d printed a lot of them and made a mural.

    it's actually hard to tessalate them.

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  • [–] 5 points 7 months ago (1 child)

    You know what? If you want to be a prick you could hire a contractor to tesselate it lol. "Hey, I already have the tile, can you assemble it for me?"

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  • [–] 22 points 7 months ago

    When these went viral in 2022 I read the research paper and found out that not only do they form a non-repeating pattern, but that non-repeating pattern relies on the occasional tile being reversed. That inspired me to 3D print a bunch of these that were a different color on each side and try assembling them. It's very interesting, because you have a lot of options for how to put them together, but occasionally you'll hit a point where the pattern itself forces you to put one in upside down, even though it's non-repeating. Also, it's possible to put it together "wrong" where at one edge you can't add any more tiles in either orientation and have to disassemble part of it to continue. Very interesting to mess with.

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  • [–] 17 points 7 months ago (2 children)

    Is it just me or is the radial pattern not apparent to others? Starting with the red "hat" top center, work outward in a spiral. It's not bilaterally symmetrical, but it appears to be chiral.

    Going to read more about this.

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  • [–] 6 points 7 months ago (1 child)

    That's a surprising prooerty for a shape that's just 8/3 of an equilateral triangle

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  • [–] 6 points 7 months ago*

    I wonder if there's a way to apply this pattern to create some specific kind of cellular automaton.

    Honestly idk enough about this stuff to even know if that's a dumb question, but at the very least, the image reminded me of that.

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  • [–] 5 points 7 months ago (1 child)

    I don't really get it, don't the colors highlight the repeating patterns? How can it not have repeating patterns with clearly repeating patterns like that? They're probably using some useless definition of "repeating", right?

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  • [–] 9 points 7 months ago

    Local repetition exists but global repetition does not. Think of it like wallpaper. There is no way to put this "pattern" on a wallpaper in such a way that two identical strips of wallpaper fully match each other at the edges.

    Look at a more zoomed out version to see it clearly. It always looks close to being repeating but then you see a part that's just a little bit off.

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  • without a doubt, they would me awesome for some kind of board game

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  • [–] 1 point 7 months ago

    is this the pattern that was found on the walls of a 1000 year old chapel in like Uzbekistan?

    according to the scriptures of that particular sect it was called "the pattern of life" or something.

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  • [–] -1 points 7 months ago