What architectural feature is noted for its first interior use in the Temple of Apollo Epikourios?

The Temple of Apollo Epikourios is notable for incorporating the Corinthian capital within its interior design, marking a significant moment in architectural history. This temple, located in Bassae, Greece, is often celebrated for its unique and innovative features, including the first documented use of the Corinthian capital in an interior space. The Corinthian style, characterized by its ornate and elaborate design featuring acanthus leaves and scrolls, represented a transition towards a more decorative architectural vocabulary that would become prominent in later Roman architecture.

The use of Corinthian capitals in the Temple of Apollo not only showcases the evolving aesthetic preferences of the Classical period but also signifies the architectural experimentation that was taking place at that time. This particular capital style would go on to dominate the architectural landscape in later periods, especially in Roman and Renaissance architecture, due to its elegance and visual impact.

In contrast, the other architectural features mentioned, such as the Doric column, Ionic capital, and fluted column, while also historically significant, do not represent the unique characteristic attributed to the Temple of Apollo Epikourios. The Doric column is minimalist and sturdy, the Ionic capital is recognized for its scroll-like volutes, and the fluted column refers to the vertical grooves that run along