This technique is a great example of a delayed reaction for me. Many years ago someone in my guild demonstrated how to make a standard bicone bead shape using a flat plate. It didn't exactly click with me then as something I was interested in, but I stored the technique in the back of my brain for future reference. Last year, I tried a make a few bicones this way, but I noticed there was this pesky tendency for any pattern to start swirling. Not realizing the potential, I tried to undo the swirl!