Hey Carolyn, I guess I came in a little late on this one but I love your diagram. NEAT!! But question....after you sew the 4 blocks together, where do you cut them apart. I have done the disappearing 9 patch but that one you after sewing 9 blocks together, you just cut that in half horizontally and vertically.....but your 4 patch looks like it might be cut and inch or so to the right and left of the seam line. Is that right or did you divide it in thirds. Would love to try yours. Thanks, Sandrea