No I actually I do not believe they are art.
Andrew maintains the beauty of wood by keeping its innate material and preserving it. In some of his works he tried drying wood under the sun for several years and put in some enhancing solutions that would make the beauty of wood to come out. He doesn't make perfect changes to wood designs and keep it as it is.
Answer:
As per Google's dictionary, a door is a hinged, sliding, or revolving barrier at the entrance to a building, room, or vehicle, or in the framework of a cupboard.
So, if a door does not barricade anything, it is not a door. It becomes a thick sheet of wood.