I want to post you this video, because I think is really interesting.
The video is about Möbius strip.
A Möbius strip is a surface with only one side. And we say it is "handedness" (it is nor right-handed nor left-handed). Möbius is the surname of a 19th Century mathematician. He discovered that this special figure had some curious properties. Some of them you will find them in the video.
You can try in your houses if you like. You can do a model by taking a paper strip and giving it a half-twist, and then joining the ends of the strip together to form a loop.
I am sure you can ask in class about this string in science classes and maybe someone could explain you more things. If you want more info you can look here.
This figures are also related with an artist called Escher. Here you have some information about him. And I post you some images I like:
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