Natural edge bowls are made so that the top of the bowl is the outside surface of the tree. Many natural edged bowl still retain the bark. Burls are very well suited for natural edge bowls. When you start turning a cherry burl, you don’t know what you will find inside. It could have bark inclusions or knotholes that have rotted away, or it could be hollow inside because it was colonized by carpenter ants. If you are fortunate it is solid and free of internal cracks and damage.