This is perhaps the most widely used knot for suspensions in the Japanese style, and I've only recently come to realise that it's probably the most misunderstood and misused one as well. Certainly everything I've written about it in the past needs a complete revision.

Most of the tutorials about the BB fail in the same way. They're fine about making the wraps, crossing the working end over and passing it underneath the wraps. Then they tend to say something like "tie a square knot to finish" and leave it at that.

If I may quote from the greatest book ever written (Moby Dick):

"what plays the mischief with this masterly code is the admirable brevity of it, which necessitates a vast volume of commentaries to expound it."

There's a lot to be said about that square knot, and I intend to say it. But if my commentaries are to be understood, they'll need some illustration. I'll try to get some shots for that purpose during my next Convolvulus shoot in a bit over a week. And then I'll report back.