Primary attention shall be given to the preservation and interpretation of the museum character of the principal corridor on the ground floor and the principal public rooms on the first floor of the White House. Articles of furniture, fixtures, and decorative objects of the White House, when declared by the President to be of historic or artistic interest, shall be considered to be property of the White House. Any such articles, when not in use or on display in the White House shall be transferred by direction of the President as a loan to the Smithsonian Institution for its care, study, and storage or exhibition. Any such article shall be returned to the White House from the Smithsonian on notice by the President.