The three and a half seconds puzzle.

Yes, the latter of what you say is what I meant. The two single knots can be slid together forming a Double Fisherman’s knot.

It is just a silly knotted structure I had thought of, just to illustrate my point, in the simplest possible way, of how you can increase or decrease the turns of the helical coil in a [i]Helical loop[/i] (1)(2).

It is totally useless, I guess - but who knows ? Perhaps somebody will find a use for it in the future:slight_smile:
It is PET -1 - if you consider the straight line as the ( most simple possible ) continuation of the Standing End ! :slight_smile:

  1. http://igkt.net/sm/index.php?topic=4949.msg35017#msg35017
  2. http://igkt.net/sm/index.php?topic=4949.msg35100#msg35100

The way I untied it yesterday I ended up with an overhand knot in my hand, then I could not quite remember how I tied it the bight. Maybe I wasn’t concentrating when I untied it somehow. Still trying to remember how I tied it to check again :slight_smile: