If you want to know what a disappearing nine patch is, you can look it up on the Internet. Basically, you start with a nine patch and cut it in half in both directions. You end up with four pieces that can be arranged in a number of different ways.
My guild had its annual Demo Day and this was one of the demos. Fortunately I didn't have to make any nine patches because my UFO stash contained a box of 35 nine patches that were already made! And voila!