At quarter speed, in case you’re trying to follow along. (The only rope I can find at home is 20m long, so I’m using an old USB cable.)pic.twitter.com/HW6ycxtj0J
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Even slower (10% speed), and flipped so it’s like looking in a mirror, which I find makes it easier to copy.pic.twitter.com/U3cViQLvkM
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Oh, wow! Louis Kauffman’s book _On Knots_ has an amazing illustration of how to perform this trick. Thanks
@RobJLow for drawing my attention to this!pic.twitter.com/fmsTSEevAQ
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At the end of the movement he rotates his hands out of the loops?
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Ah, from the Nature of Things documentary about Martin Gardner...I just happen to have randomly stumbled upon it a few hours ago while exploring links from an online library...I like the bit that starts just before it at around the 12 min 45 sec mark

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Tooks us quite 20mn slow mo to understand and redo this trick !
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It took me a lot longer than that!
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Been doing this trick for 30 years. Easiest slight of hand. Perfectible in an instant. Which combined with the effect... Gives it great virture. Of course there really is a way to tie a knot without letting go of the string. And yes, that other path uses a ruse.
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Are you referring to the old “fold your arms before picking up the string” ruse?
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Easy, he just moves his left hand through a 4th physical dimension
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