I just Googled her and it looks like you would have to go to the workshop to find out. Looks to me like if you would put 2 clamshells together to where they form a circle by interlocking then to me it looks paper-pieced sort of. I'm not that advanced/experienced but that's what it looks like to me. Sorry I can't be of more help. I have a template for a clamshell. I'm going to play around with it and see what happens. Hope you get more help but Google and see what you might find. Good luck!