 The frieze is one of the major decorative elements of the building and carries a sculptured relief.In the case of Ionic and Corinthian architecture, the relief decoration runs in a continuous band, but in the Doric order, it is divided into sections called metopes, which fill the spaces between vertical rectangular blocks called triglyphs.The triglyphs are vertically grooved like the Doric columns, and retain the form of the wooden beams that would once have supported the roof.