Research

Horse rider

Details of the procession like the one of the rider taming the wild, rearing horse echo the common theme of the temple of cosmos over chaos, human over animal. The bulging veins and wild expression of the horse clearly bring out its chaotic nature. The detail makes an interesting comparison to the famous chorus from Sophocles tragedy Antigone:

[332] Wonders are many, and none is more wonderful than man. [335] This power spans the sea, even when it surges white before the gales of the south-wind, and makes a path under swells that threaten to engulf him. Earth, too, the eldest of the gods, the immortal, the unwearied, [340] he wears away to his own ends, turning the soil with the offspring of horses as the plows weave to and fro year after year. [343] The light-hearted tribe of birds [345] and the clans of wild beasts and the sea-brood of the deep he snares in the meshes of his twisted nets, and he leads them captive, very-skilled man. He masters by his arts [350] the beast who dwells in the wilds and roams the hills. He tames the shaggy-maned horse, putting the yoke upon its neck, and tames the tireless mountain bull. [354] Speech and thought fast as the [355] wind and the moods that give order to a city he has taught himself, and how to flee the arrows of the inhospitable frost under clear skies and the arrows of the storming rain. [360] He has resource for everything. Lacking resource in nothing he strides towards what must come. From Death alone he shall procure no escape, but from baffling diseases he has devised flights. [365] Possessing resourceful skill, a subtlety beyond expectation he moves now to evil, now to good. When he honors the laws of the land and the justice of the gods to which he is bound by oath, [370] his city prospers. But banned from his city is he who, thanks to his rashness, couples with disgrace. Never may he share my home, [375] never think my thoughts, who does these things!

Source - http://employees.oneonta.edu/farberas/arth/ARTH200/politics/parthenon.html