Okay kiddo, have you ever made a paper chain before? Imagine taking a really long strip of paper and twisting it around and around until it looks like a long helix, like a curly straw. That's kind of what the Boerdijk-Coxeter helix looks like!
But instead of paper, it's made out of math. The helix is made by taking a bunch of shapes called regular polygons and using them to wrap around a cylinder. The polygons are all the same shape and size, and they're fitted together like puzzle pieces to make a long, curvy chain.
This special helix is named after two really smart mathematicians named Boerdijk and Coxeter who figured out how to make it. It's a really cool way that math can make crazy shapes, don't you think?