I bet it's a lot harder technique-wise to draw in empty space than the video makes it appear. If you go too fast, it won't be self-supporting, and if you go to

I bet it's a lot harder technique-wise to draw in empty space than the video makes it appear. If you go too fast, it won't be self-supporting, and if you go too slow, the already drawn part will be in the way and probably get pushed aside.