You show a long rope. - Wrap it around your hand.
When you pull it back from your hand, you'll find, surprisingly, four knots on the rope! You demonstratively undo one of them.
Then wrap the rope around your hand again, blow again - and lo and behold - the three remaining knots have vanished into thin air!
You can even give the rope to be examined and then perform other rope tricks with it!!!
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* applies to deliveries within Germany, delivery times for other countries can be found on the shipping information button
