Crane Model Step 3

Flatten the model, and turn over

If it all went well, you should have a tall diamond on top of a
square diamond. Flip the model over.
 

Turn the model over.

Now you have the same thing you had before you did those strange
valley folds.
 

Valley folds like the other side. Put your fingers under the first sheet of paper at the edges of the fold.

Do that strange valley fold again. Slip your fingers under the
first layer of paper, marking the edges of the fold, and flip the
layer over to create a diamond that matches the one you made
before.