In the centre of the scene is the herald who raises his right arm to announce the start of the procession. In his left hand he holds a caduceus or salpinx (trumpet), a metal object that was attached to holes in the marble. To the left, a horseman stands by his horse and to the right is a groom with his master's himation (cloak) over his shoulder. The unbridled horse with its long carefully tended mane lowers its head to rub its muzzle against its front leg, in a scene that is new in ancient Greek art. Photo via Newscom