>> See here the introduction to the wire puzzles <<
This is another beautiful choice that feels nice in your hand, and this puzzle also offers a very interesting challenge.
A friend of mine once tried to solve it and he simply quit by putting it back on the table – "I have no idea what to do with it".
I don't think this puzzle is a complex one, but it seems to have this effect on people. It can seem abstract and unsolvable, and in my ranking, it's right below the most interesting puzzles I've ever seen.
It is possible I would've placed it much higher if I had not been lucky and solved it relatively quickly.
The downside is that, once you solve it, everything is revealed. There is no potential for a second or a third challenge, unlike with many other puzzles that require multiple completions until you have mastered them completely.
However, this is a beautiful, robust puzzle, which is a big plus alongside the challenge it offers. I definitely recommend it.