The term entasis refers to a slight swelling or tapering of a vertical column or object. It is a design element commonly used in classical architecture and furniture design to create a sense of visual stability and aesthetic appeal. The purpose of entasis is to counteract the optical illusion that straight lines appear concave when viewed from a distance. By incorporating entasis, furniture designers can create a more harmonious and visually pleasing form. Slight swelling of a column at the middle desgined to overcome the illusion of hollowness in a straight column.