This tie is a variant on the box-tie-ball-tie theme, just tied tighter so the slave girl's body folds double.

Ariel says: "Dave told me that this is actually a genuine historical torture position, because it becomes more and more agonisingly painful as the minutes and hours tick by. I was only in it for about 15 minutes, and he'd kindly tied it less-than-brutally tightly, so I could still move around a bit. And I'd have to say that it IS pretty uncomfortable, but I enjoyed every minute of it. "