I there... I'm the original author of the Disappearing Nine Patch Series... writing and designing the first and second edition.
I first demonstrated this over 20 years ago. AND YES... one publisher... has stepped on my copyright rather a bit.
The technique is still a process that is evolving. I'll be showing some brand new variations during the Houston Quilt Festival, 2010. That class is already sold out!
Quilters are smart. They know the 'original' when they see her. ;-)