This particular joining creates a ridged ripple along the squares as seen on this blanket.
How I create this raised ripple pattern.......
Tip: work as you go, then you don't have look at a mountain of squares you have to join. (this only works with squares that do not need to be blocked.)
As you know a granny corner has three chains. You will be joining the squares together at the middle chain of the granny square.
You will work evenly through both loops along both squares.