entasis


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entasis

(ĕn`təsĭs) [Gr.,=stretching], the slight convex curvature of a classical columncolumn,
vertical architectural support, circular or polygonal in plan. A column is generally at least four or five times as high as its diameter or width; stubbier freestanding masses of masonry are usually called piers or pillars, particularly those with a rectangular plan.
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 that diminishes in diameter as it rises. This device, as used by Greek builders, was of extreme subtlety, the freehand curvature being merely sufficient to guard the contours of the column from any appearance of inward sagging. In the Doric columns of the Parthenon, 34 ft (10.3 m) high and 6 ft 3 in. (1.9 m) in diameter at the bottom, the total convexity amounts to only 3-4 in. (1.91 cm). In Greek Doric columns the entasis began at the foot, but in the Roman orders it was confined to the upper two thirds of the column.

Entasis

Intentional slight curvature given to the vertical profile of a tapered column to correct the optical illusion that it appears thinner in the middle if the sides are left straight.

Entasis

 

in architecture, a convexity in the shaft of a column, usually located in the lower third of the column. It lends the impression of strength to the column and eliminates the optical illusion of concavity.

entasis

[′en·tə·səs]
(architecture)
The slight swelling visible in the profile of a column, used to correct the visual distortion that makes a straight column seem to have a concave profile.

entasis

entasis: proportions are much exaggerated
The intentional slight convex curving of the vertical profile of a tapered column; used to overcome the optical illusion of concavity that characterizes straightsided columns.
References in periodicals archive ?
Tickets2Nite, LLC is owned by the Company and Entasis.
The elevated wing seems at first sight to be a pure cubic volume, but it too is manipulated, rising from the body of the building to its cantilevered end--an adjustment that, like entasis, is an optical correction to lighten its appearance.
A distinctive form within which spiralling light wells harness pressure differentials and daylight to improve passive ventilation and lighting performance, and external entasis reduces the building's perceived bulk and contribution to street level wind pollution.
In your work, architecture helps to define a way of looking: an example would be the way you use entasis on the frames of your paintings to help structure the way of looking.
The entasis of this skyscrape r, like that of a Doric column, leads to a new kind of propositional beauty, one worked out digitally.