entasis

• Légère convexité ou renflement volontairement donné au fût d'une colonne, destiné à corriger l'illusion d'optique de concavité que produirait un profil parfaitement rectiligne.

A slight convexity intentionally introduced into the shaft of a column, designed to counteract the optical illusion of concavity that occurs when the sides are perfectly straight.

1. Architectural convexityC2formalart

   A slight, intentional convex curve in the shaft of a column, designed to correct the optical illusion of concavity that occurs when the sides are perfectly straight.

   Entasis (convexité architecturale)

   • The ancient Greek architects used entasis to make their columns appear straight from a distance.
   • The Parthenon's columns exhibit a subtle entasis.
   • Without entasis, the columns would look like they were bending inward.