The west pediment faced the Propylaia and depicted the contest between Athena and Poseidon during their competition for the honor of becoming the city's patron. Athena and Poseidon appear at the center of the composition, diverging from one another in strong diagonal forms, with the goddess holding the olive tree and the god of the sea raising his trident to strike the earth. At their flanks, they are framed by two active groups of horses pulling chariots, while a crowd of legendary personalities from Athenian mythology fills the space out to the acute corners of the pediment.
The work on the pediments lasted from 438 to 432 BC, and the sculptures of the Parthenon pediments are some of the finest examples of classical Greek art. The figures are sculpted in natural movement with bodies full of vital energy that bursts through their flesh, as the flesh in turn bursts through their thin clothing. The thin chitons reveal the body underneath as the focus of the composition. The distinction between gods and humans is blurred in the conceptual interplay between the idealism and naturalism bestowed on the stone by the sculptors. The pediments no longer exist.