This is the piece of wood of the zelkova for 21 years which has a branch in the head.
I carved the core from the branch of the head to a bottom end along the annual ring of the 19 years that count from a surface.
By the way in a wooden branch There are two kinds of how to separate.
One is that the growing point at the tip of a tree branch into two like a letter of Y.
Another It is a branch comes out from the middle of a trunk or a branch.
Now, branch of this piece of wood are Y altogether.