File:Frontons. A pediment is an element in classical, neoclassical and baroque architecture, and derivatives therefrom, consisting of a gable, originally of a triangular shape, placed above the horizontal structure of the entablature, typically supported by columns. The tympanum, or triangular area within the pediment, was often decorated with relief sculpture depicting scenes from Greek and Roman mythology or allegorical figures.
Graphic History of Architecture by John Mansbridge. "Pillars and wall cornings were prime structural elements which were given amazing ornamentation. It sets the tone and mood before entering a building"