This is what a timber looks like when its not cut yet its also called like circle timber
happen when you cut down a tree it will shape like this
This is what it look like when its already cut and do you notice its like flat like the circle timber one generally all planes are used to flatten reduce the impart a smooth surface to a rough piece lumber or timber
Now this what happens when you flattened them all we collected them we softened with our machine we sometimes we use hands to soft them at planed tool for shoping wood with muscle power