The braid basic unit is this. The bracelet or ring is made by "wrapping" that around a cylinder or circle. Multiple copies line up with each other because this is a "tileable" shape, just like tileable images. Well - tileable in one dimension anyway.

 

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)