You will need 9 different fabrics in any colours or pattern.
On the reverse side of each white square draw a line with a pencil, just dark enough for you to see. The line should go diagonally across the little square. A sharp pencil will make this job easier and more accurate.
Take a 5” square and place a small white square accurately in each corner so that the diagonal line runs across the corner like this.
Press the white points out and press the seam towards the dark fabric.
Et voilà! The block is complete. Happy sewing.