Finally, been working this for a while. Just couldn't get it, even though the architecture is very simple, and I loved geometry (hated algebra) in high school. According to the creators of the Contemporary Geometric Beadwork books, this is (mine is on the top) a Wing Bangle. I started by using a pattern created by the very generous Barbara Briggs, (bottom), however, at a certain point I got all messed up and couldn't follow, so some of the top half is improvised. I think it's kinda weird, and plan on making a more normal one.