The period in Greek art and architecture conventionally dated from from the Greek victory over Persia in 480/479 BCE to the death of Alexander the Great in 323 BCE. The Classical period was preceeded by the Archaic and followed by the Hellenistic period. Classical art is characterized by restraint and idealization. Sculptors in stone and bronze left behind the stiff poses of the kouroi and korai to explore more natural poses, depicting figures in motion and at rest. In vase-painting, the red-figure technique replaced the black-figure technique, as painters came to appreciate the greater naturalism made possible by drawing details with the brush, rather than incising them into the clay surface. Architects strove to create temples with harmonious proportions, based on the Doric and Ionic orders. Web resource here.