Is it safe to install shelves on wood shed doors?

It is safe to install shelves on a wood shed door, assuming the shelves are made out of wood or a light material. Using a heavy material, such as metal, may weigh the door down, making it more difficult to open and close. It is advised that if you are installing shelves to the door of a wood shed, that they are cupped shelves, so that things cannot roll off with the force of the door opening and closing. Also, make sure that the shelves always have a prominent object on them, because an empty shelf is just inviting you to walk into them if you are in a hurry.