To make the center block, align a
Color 4 3-1/2" square on the top left corner of your Color 5 6-1/2"
square. Mark a line on the diagonal, in the direction shown and sew ON this
line. Trim off
the excess, and press seam allowance towards small triangle, then add another Color 4 3-1/2 " square to the opposite corner, in the same manner...