Greek cities spread over new regions because of wars and overpopulation in Greece in the fourth century. Greeks’ king the Alexander the Great expended his territories to Anatolia (even near to India). This expansion called for the end of the classical period.
Architecture was moving from Classical to Hellenistic style. Axial approach of Hellenistic structured was adopted from Akropolis of Athens. Also, column and the wall that used to be thought separately, were now combined together. Parthenon has two rows of columns dividing a space into three and cella surrounded by frieze has strong columns invites its visiters. I mean, these styles are conglomeration of older achievements and changes in coexist styles.
The temple of Apollo pursues for three dimensional appeerance and strong sunlight emphasizing the statue. Design of light and shadow condition is linked with religion and deity of light. Corinthian which is new architectural order appeared in the temple of Apollo. This order has a capital with natural attrubitions added on the Ionic and Doric columns. Its aims are more grounded on decorative purposes. Cella has dominated the plan with continuous frieze along the three sides and cella columns molded into the walls. It creates sense of expension by increasing open space of cella. Cella columns that used to carry roof now passed its job on the walls. In so doing it also passed its meaning and became more figurative element of the design.