Now place a Color 1 small square right
sides together atop a Color 3 rectangle, with outer edges aligned.
On the back of the top square lightly mark the diagonal. Sew ON this
diagonal marking. Cut off the excess seam allowance. Press the
remainder towards the triangles. Make four with the triangle
slanting in one direction, and four more with the triangle slanting
in the opposite direction, as shown at top left. Sew one of each of
these on each side of the four side units made in the step above.
Sew red squares to the ends of two of these units...