There are a great number of portraits of governors and lieutenant governors contained in hearing rooms and offices throughout the building, and in public spaces there are several large scale artworks that memorialize individuals or events significant to the state or the nation. Ohio artist Howard Chandler Christy is represented with two paintings that depict the signing of the Treaty of Greenville, a seminal event in state history, and a painting that honors another Ohio native, Thomas Edison. President Abraham Lincoln visited the building on three different occasions, and a large marble bust erected after his death memorializes him and also depicts the Union victory at Vicksburg. The floor of the Statehouse rotunda is composed of almost 5,000 individual pieces of marble, all cut and fitted by hand. The design at the center of the floor traces the development of the United States: the 13 stones in the center represent the original colonies; the three rings symbolize areas of territory that enlarged the nation; surrounding the rings is a star burst with 32 points, one for each of the states in the Union when the floor was laid down; and surrounding the entire design is a gray band representing the U.S. Constitution.