A deceptively easy looking obscure disentanglement brain teaser, that I found in a remarkable book on brain teasers from 80's. When you start solving it, you think "this has to be very easy". Hours and days go, and slowly a feeling sets in that your brain is not up to the level of this crazy problem. Then you suddenly find the solution, no idea how. Banal stuff, but when you solve it, you feel like million bucks.
I think it was something like this: https://image.ibb.co/nsz4x0/puzzle.png The goal is to separate the string with the beads from the rubber piece. The rubber has 5 holes in it. The beads cannot go through the hole.
