Also known as Navajo plying. You make a loop, pull another loop through it, pull a loop through that. And so on. The first video here shows the big picture:
You can get the idea. After I watched the video, I thought it still looked a little mystical (cool!) so we (the husbeast is my camera man) shot another vid, this time in close up of my right hand.
...that didn't really demystify it much, but if you watch closely you can see I pull the single through the loop as soon as both hands get close together, then I pull a LOOP, not a single thread, back toward the bobbin to grab the single and then hang on to the loop and a single - looks like three separate threads, but it's a U of thread and then the bit going back to the bobbin. It just LOOKS like three. Then once I get up near my left hand, I loop it through and pull away again.
Hope that clears things up.
(If you're saying "DUDE! What's up with the rings??!!?" well, I think they're making my grip strength a little better. Sort of like one of those brace-things for tennis elbow. The braces re-direct the muscle 'pull' and make it more effective. Maybe.)
Sorry for the lameass posting the last couple, but I've been doing all kinds of crap the last three days, and by the time I sit down to post, it's evening and I'm too damn tired. I've been researching the Public Land Survey System for a blog post on Ohio and Pennsylvania history. (Specifically, what makes them so different, when I'm only moving seventy-five miles/120km.) It'll probably get expanded to two posts, but it's interesting in a cultural geography geek kind of way.
In the mean time, I've got two dozen cupcakes to ice (and I've got to make the icing) before I go to bed tonight, and it's already eight thirty.