Next, using a scant 1/4" seam now and throughout the rest of the
block-making, sew a Color 1 2-1/2" square to the top
of four half square units, being sure to have the half square oriented
as shown at top-left of this paragraph. Press seams towards
squares. You are to make four of these units...
Next, sew a Color 1 2-1/2" square to the left of
four more half square units, again being careful of the orientation of
the half square. Add a Color 2 2-1/2" square to the right
of the half square units. Press seams towards the half squares. You
are to make four of these units..
Sew the shorter of the units we just made to the right of four
Color 2 4-1/2" squares, pressing seams towards the large
squares. Add the longer unit to the bottoms of each...