I'm afraid that I must agree with denise, and AkashicLiz, and BeBe53...

While I'm not "math-challenged" I just don't get it. I read the article in the current Threads magazine too, and I still couldn't figure it out. If I put my head where the head is, I am too short. Well after decades of trying to reach the upper cupboards in my kitchen, I already know that (ha ha!) And truly, it would be useful to have more suggestions as to what and how to choose your "best silhouette"...

Mostly I adore your magazine, I have an almost complete collection of back issues, and refer to them all the time, for various techniques and inspiration.