This is an illustration of the Administration Building during construction. The frame of
the building was constructed mostly of wood and then covered with plaster-like material called staff. The fair buildings had lots of decorative detail because staff is easy to mold and shape. The buildings were then painted white to resemble limestone or marble.
Bancroft, Hubert Howe. The Book of the Fair. Chicago: The Bancroft Company, 1893. Further reproduction or distribution is prohibited without permission.