Greek art in the Classical and Hellenistic eras marked a pivotal shift in artistic expression. The Classical period, from 480 to 323 BCE, emphasized idealism and harmony, with sculptures like the Doryphoros showcasing perfect proportions and natural poses. The Hellenistic era, starting in 323 BCE, saw a move towards realism and emotion. Artists explored new subjects and techniques, creating dynamic works like the Nike of Samothrace. This period's influence extended far beyond ancient Greece, shaping Roman art and later movements.