The thing is that it is an object with no up or down side. Cut a strip of paper, give it a twist and stick the two ends together with glue. If you put a marker on the paper and keep drawing a line, you’ll cover both sides without lifting the pen.
And there’s a cool party trick too, perfect for a wedding or anniversary. If you cut the strip in halves on the line you drew, you’ll end up with two interlocked heart shapes 🙂
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