||Sew a short Color 2 strip to the bottom of a Color 1
square. Press seam to strip side. Sew a longer Color 2 strip to the
right side of that unit, again pressing seam towards new strip. Next
sew a shorter Color 3 strip to the bottom of the unit, then a longer
Color 2 strip to the right. Repeat this with the Color 3 strips.
Make two units just like this, and then make two units with the side
strips added to the LEFT...