This pattern is designed by arranging and sewing together 9 squares to create a traditional 9 patch block. Keep the center block of the 9 patch the same fabric, 4 blocks the background fabric and 4 corner blocks different fabric.
Then cut down the middle vertically and horizontally to give you 4 pieces.
Then sew them together in this design and be sure to square them up. There are lots of tutorials on line to demonstrate the Disappear 9 Patch.