make the 9 patch then cut into the disappearing 9 block...I just did two of them. They are posted on my blog. Thriftyideastoday.com. One was made from 4in squares the other 5 inch - its really easy...once you have sew the 9 squares together you just cut the block in the middle and than again in the middle...looks really nice. It also looks hard but its very easy.