Roy Miller commented on the “mind twister” photo. I put together a visual description of the process. It is something I devised in the early 2000s and go back to it now and then.PF gallery here: https://people.rit.edu/andpph/gallery.html The illustration of the process is here: http://www.davidhazy.org/andpph/2020-pix/2006-how-twist-screw-streak-made.jpg I hope you find this informative. ;) Andy
