"The constrictor knot is a way of making a secure, temporary or semi-permanent binding (it’s a good temporary whipping for a rope, closing a bag, or holding a punch of poles together.)" here's my video on this knot with a no-tangle paracord skein
Concept from Korean designer Sungho Lee: Intuitively, I love it! How clever! I want to make a bunch of my own—as I imagine Mr. Lee did—by cutting up some paper clips, clipping the leads on a bunch of LEDs, and soldering the one to the other.