The Library of Celsus is probably the most distinctive building commonly associated with Ephesus. The library has a two-storey facade, and its interior is one large room with dimensions of 10.92 × 16.70 meters. The two-storey structure was supported by four pairs of columns, between which there were three entrances to the building. At the level of the second floor three windows were placed, illuminating the reading room. The statues adorning the figure of Library of Celsus represent the four Virtues: Sophia (Wisdom), Arete (Bravery), Episteme (Knowledge) and Ennoia (Thought).