I have done the tube in several different ways, even with beads, but I have never did it this way. It is foreign, but you can understand it by looking at the video. This can be used in so many different ways with different sizes yarn and hook.
various methods of joining hairpin lace crochet - some a sort of cable using no extra yarn, others basic crochet stitches; this is hairpin heaven! scores of detailed charts, pics on hairpin techniques ideas.