Let's say you have a painting. As it happens, the painting is Magritte's Golconde. You apparently really like Magritte.
For mysterious reasons (hey, this is what you want, not me), you want to hang it up in a special way. Some string is attached to the painting, and you want to hang it on two pins that are in the wall. You want it such that removing either of the two pins will result in the string unwinding and the painting falling down. How can you do it?
After you've figured that out, there is a vastly more difficult problem to solve. See, you have Escher's Knots, and you want to hang it on the wall too...
Can you hang this on 3 pins such that removing any one will result in its fall? In a brief moment of insanity, you wonder, can you find a way to hang it on N pins such that the removal of any M pins will result in its fall?
There will, of course, be some difficulty in conveying a solution to me without pictures, but you're obviously very creative, so you can figure it out. I might add that the solution to any case with more than two pins is too hard to draw anyway.
Spoiler alert: Solution here