For the block's corners, place a Color 2
square atop the left end of a Color 1 rectangle, right sides together and edges aligned.
On the back of the square draw the diagonal in the direction shown at left. Sew on
this drawn line. Cut off the excess seam allowance and press the remainder towards the
triangle. Repeat this with another square on the other end of the rectangle, drawing the
diagonal in the opposite direction. Make four of these flying geese
units in total. Make four
more rectangle units in the same manner, but with the seam lines of these facing
in the same direction (squares sewn on opposing corners this
time), as shown in the bottom two
illustrations at left (make two of each)...