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8 votes
0 answers
201 views

Is it possible to create a knot that is locked only when the rope is stretched?

Is it possible to create a knot that is stable/locked when the rope is stretched? When the tension is relived the knot should open.
Superluminal's user avatar
8 votes
4 answers
2k views

How to use a Mobius strip for puzzle creation? [closed]

A Mobius strip is one of the basic concepts of topology. There are many interesting tricks using this strip (for example, interesting results of cutting the tape with a different number of turns). ...
Nick's user avatar
  • 1,701
9 votes
2 answers
885 views

How to generalise hang picture puzzle?

There is well known problem: The picture is attached to a string and you want to hang it on N nails so that if one takes out any of the nails, the picture falls. How do you do it? For those who ...
klm123's user avatar
  • 16.3k