Non-repeating pattern

This 13-sided figure is the first that can fill an infinite surface with a pattern that is always original.

But is it really? I'm not convinced. The blue polygon is mirrored. In my opinion that's a different shape.

https://www.smithsonianmag.com/smart-news/at-long-last-mathematicians-have-found-a-shape-with-a-pattern-that-never-repeats-180981899/

[John Falconer]

I went to the link but couldn’t really understand the issue. Too tired I guess!!

[Agnes]

Een Escher?

[Mek]

@johnfalconer haha! Don’t worry, the world is not in danger :-)

[John Falconer]

@mastermek
:-(

[Mek]

@agnesvanderlindeicloudcom daar lijkt het een beetje op ja. Maar nee, eigenlijk is het alles was Esher niet deed :-)