A classical Greek building with a long open colonnade, one- or two-story, for civil, religious, or commercial purpose. It essentially was a long, straight colonnade, with vertical wall (and sometimes rooms) behind and roof over. The colonnade is sometimes doubled, and a projecting wing may be added to either end. They are often found on the edge of an agora or a temenos. Several such buildings are in Athens, from about 650 BC onwards, such as the Stoa of Attalus and Stoa Poikile (c 460 BC). The popular Hellenistic and Roman philosophy of Stoicism takes its name from the Stoa Poikile.