Sorry Quilt E I am picture challenged. My DIL does them for me. It is very simple though, think 4 prairie points facing inward to reform a square. You can use prairie points or sew the triangles in the same shape. The 4 triangle pieces are laid and pinned over the peek-a-boo block (they should make the same size square as the square you are covering) and the triangles/block are sewn into the quilt or sashing etc. Since the triangle seam allowance is pressed outward to match the block edges, the triangles seem to stay closed quite well. When the quilt is completed, the triangles are free moving and the little person peeks under them to see the surprise. Clear as mud right?