What term describes the Greek optical refinement where columns appear thicker toward the base?

• A. Doric emphasis
• B. Perspective
• C. Golden ratio
• D. Entasis

Answer: (D)

Entasis is the slight convex shaping of a column shaft used by Greek architects to counteract the optical illusion that a perfectly straight shaft would look too slim as it rises. By introducing a gentle swelling along the shaft, usually more noticeable in the lower portion, the column reads as stronger and more proportionate when viewed from a distance, giving the impression of thickness toward the base. This optical refinement makes the overall architectural ensemble feel balanced and elegant. Perspective is a broader concept about depth in art, the golden ratio is a specific proportional rule, and Doric emphasis refers to stylistic features of the Doric order rather than this corrective curvature.