For each block cut 4 squares measuring 8 1/2 by 8 1/2 inches. Press the seams in opposite directions so you can lock the seams together at the intersection. Sew them into a 4 patch and press.
- Centre block - rotate by 180 degress.
- Swap the top and bottom rectangles over.
- Swap the left and right rectangles over.
- Leave the large squares in place