To sew the block's four corners, sew a smaller trap right sides
together to the short side of the larger trap. Add a Color 2 quarter
square triangle to the other side of the shorter trap. Press seams to
darker side. Make four units like the one shown at top left, and four
more in reverse. Join each pieced triangle with a reverse pieced
triangle, pressing seam to one side. Square these off to measure
3-1/2" square if needed...
...on to Page 2!