What I meant about them not being symetrical is that they are not the same if you flip the pattern over. When you are doing fusible applique, you need to reverse patterns that the pieces aren't the same - like letters in the alphabet. An "F" isn't symetrical, so you would need to turn the paper over & trace the letter on the back side & use that for the pattern.
I discovered this when I was tracing a block onto the background fabric and realized it wasn't the same as the front-facing pattern showed. I think all the blocks are symetrical if you were to draw a line down the center and across the center, the 4 quadrants would be the same, or a mirror image from side to side or top to bottom.